##### Table of Contents

2006

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UNITED STATES

SECURITIES AND
EXCHANGE COMMISSION

Washington, D.C. 20549



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Form 10-K



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|x | ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | ------------------------------------------------------------------------------------

For the fiscal year ended December 31, 2006

OR



| ̈ | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | ----------------------------------------------------------------------------------------

For the transition period from  to

Commission File Number: 1-10662



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XTO Energy Inc.

(Exact name of registrant as specified in its charter)



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|                                                               |  |                                      |  |                                          |  |           
|-------------------------------------------------------------- |  | ------------------------------------ |  | ---------------------------------------- |  | ----------
|Delaware                                                       |  | 75-2347769                           |  | 810 Houston Street, Fort Worth, Texas    |  | 76102     
|(State or other jurisdiction of incorporation or organization) |  | (I.R.S. Employer Identification No.) |  | (Address of principal executive offices) |  | (Zip Code)

Registrants telephone number, including area code (817) 870-2800

Securities registered pursuant to Section 12(b) of the Act:



|                                                                        |  |                                          
|----------------------------------------------------------------------- |  | -----------------------------------------
|Title of Each Class                                                     |  | Name of Each Exchange on Which Registered
|Common Stock, $.01 par value, including preferred stock purchase rights |  | New York Stock Exchange                  

Securities registered pursuant to Section 12(g) of the Act: None



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Indicate by check mark if the registrant is a
well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  x    No ̈

Indicate by check mark if the registrant is not required to file reports pursuant to
Section 13 or Section 15(d) of the Act.    Yes ̈No  x

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or
15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90
days.    Yes  x    No ̈

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of
registrants knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. ̈

Indicate by check mark whether the registrant is a large accelerated filer,
accelerated filer, or a non-accelerated filer. See definition of accelerated filer and large accelerated filer in Rule 12b-2 of the Exchange Act (check one):

Large accelerated filer  x    Accelerated filer ̈Non-accelerated filer ̈

Indicate by check mark whether the registrant is a shell company (as defined in Exchange Act Rule 12b-2).    Yes ̈No  x

As of June 30, 2006, the aggregate market value of the registrants common stock held by non-affiliates of the registrant was $15.4 billion based on the closing price as reported on the New York Stock
Exchange.

Number of Shares of Common Stock outstanding as of February 15, 2007367,956,962

DOCUMENTS INCORPORATED BY REFERENCE

(To The Extent Indicated Herein)

Part III of this Report is incorporated by reference from the Registrants definitive Proxy
Statement for its Annual Meeting of Stockholders, which will be filed with the Commission no later than April 30, 2007.



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##### Table of Contents

XTO ENERGY INC.

2006 ANNUAL REPORT ON FORM 10-K

TABLE OF CONTENTS



|          |  |                                                                                                |  |     
|--------- |  | ---------------------------------------------------------------------------------------------- |  | ----
|Item      |  |                                                                                                |  | Page
|          |  |                                                                                               
|          |  | Part I                                                                                         |  |     
|          |  |                                                                                               
|1. and 2. |  | Business and Properties                                                                        |  | 1   
|1A.       |  | Risk Factors                                                                                   |  | 14  
|1B.       |  | Unresolved Staff Comments                                                                      |  | 21  
|3.        |  | Legal Proceedings                                                                              |  | 21  
|4.        |  | Submission of Matters to a Vote of Security Holders                                            |  | 22  
|          |  |                                                                                               
|          |  | Part II                                                                                        |  |     
|          |  |                                                                                               
|5.        |  | Market for Registrants Common Equity and Related Stockholder Matters                          |  | 23  
|6.        |  | Selected Financial Data                                                                        |  | 24  
|7.        |  | Managements Discussion and Analysis of Financial Condition and Results of Operations          |  | 26  
|7A.       |  | Quantitative and Qualitative Disclosures about Market Risk                                     |  | 44  
|8.        |  | Financial Statements and Supplementary Data                                                    |  | 46  
|9.        |  | Changes in and Disagreements with Accountants on Accounting and Financial Disclosure           |  | 46  
|9A.       |  | Controls and Procedures                                                                        |  | 46  
|9B.       |  | Other Information                                                                              |  | 46  
|          |  |                                                                                               
|          |  | Part III                                                                                       |  |     
|          |  |                                                                                               
|10.       |  | Directors and Executive Officers of the Registrant                                             |  | 47  
|11.       |  | Executive Compensation                                                                         |  | 47  
|12.       |  | Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters |  | 47  
|13.       |  | Certain Relationships and Related Transactions                                                 |  | 47  
|14.       |  | Principal Accountant Fees and Services                                                         |  | 47  
|          |  |                                                                                               
|          |  | Part IV                                                                                        |  |     
|          |  |                                                                                               
|15.       |  | Exhibits and Financial Statement Schedules                                                     |  | 48  



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##### Table of Contents

PART I



|Items 1. and 2.BUSINESS | AND PROPERTIES
|----------------------- | --------------

General

XTO Energy Inc. and its subsidiaries (the Company) are engaged in the acquisition, development,
exploitation and exploration of producing oil and gas properties, and in the production, processing, marketing and transportation of oil and natural gas. The Company was formerly known as Cross Timbers Oil Company and changed its name to XTO Energy
Inc. in June 2001.

Our corporate internet web site is www.xtoenergy.com. We make available free of charge, on or through the investor
relations section of our web site, our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and all amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange
Act of 1934 as soon as reasonably practicable after we electronically file such material with, or furnish it to, the Securities and Exchange Commission.

We have grown primarily through acquisitions of proved oil and gas reserves, followed by development and exploitation activities and acquisition of additional interests in or near such acquired properties. We expect
growth in the immediate future to continue to be accomplished through a combination of acquisitions and development. During 2007, we plan to continue to review strategic acquisition opportunities including property divestitures by major energy
related companies, public exploration and development companies and private energy companies. Completion of additional acquisitions will depend on the quality of properties available, commodity prices and competitive factors.

Our corporate headquarters are located in Fort Worth, Texas at 810 Houston Street (telephone 817-870-2800). Our proved reserves are principally located
in relatively long-lived fields with an extensive base of hydrocarbons in place and well-established production histories concentrated in the following areas:



| | - |  | Eastern Region, including the East Texas Basin, northwestern Louisiana and Mississippi;
| | - |  | ---------------------------------------------------------------------------------------



| | - |  | North Texas Region, including the Barnett Shale;
| | - |  | ------------------------------------------------



| | - |  | San Juan Region;
| | - |  | ----------------



| | - |  | Permian and South Texas Region; and
| | - |  | -----------------------------------



| | - |  | Mid-Continent and Rocky Mountain Region.
| | - |  | ----------------------------------------

We use the following volume abbreviations throughout this Form 10-K. Equivalent volumes are computed with oil and natural gas liquid quantities converted to Mcf, or natural gas converted to Bbls, on an energy equivalent ratio of
one barrel to six Mcf.



| | - |  | Bbl              Barrel (of oil or natural gas liquids)
| | - |  | -------------------------------------------------------



| | - |  | Bcf              Billion cubic feet (of natural gas)
| | - |  | ----------------------------------------------------



| | - |  | Bcfe            Billion cubic feet of natural gas equivalent
| | - |  | ------------------------------------------------------------



| | - |  | BOE            Barrels of oil equivalent
| | - |  | ----------------------------------------



| | - |  | Mcf             Thousand cubic feet (of natural gas)
| | - |  | ----------------------------------------------------



| | - |  | Mcfe           Thousand cubic feet of natural gas equivalent
| | - |  | ------------------------------------------------------------



| | - |  | MMBtu      One million British Thermal Units, a common energy measurement
| | - |  | -------------------------------------------------------------------------



| | - |  | Tcf              Trillion cubic feet (of natural gas)
| | - |  | -----------------------------------------------------



| | - |  | Tcfe            Trillion cubic feet equivalent
| | - |  | ----------------------------------------------

Our estimated proved reserves at December 31, 2006 were 6.94 Tcf of natural gas, 53 million Bbls of natural gas liquids and 214.4 million
Bbls of oil, based on December 31, 2006 prices of $5.46 per Mcf for gas, $31.96 per Bbl for natural gas liquids and $55.47 per Bbl for oil. On an energy equivalent basis, our proved reserves were 8.55 Tcfe at December 31, 2006, a 12%
increase from proved reserves of 7.62 Tcfe at the prior year end. Increased proved reserves during 2006 were primarily the result of development and exploitation activities and acquisitions. On an Mcfe basis, 67% of proved reserves were proved
developed reserves at December 31, 2006. During 2006, our average daily production was 1.186 Bcf of gas, 11,854 Bbls of natural gas liquids and 45,041 Bbls of oil. Fourth quarter 2006 average daily production was 1.230 Bcf of gas, 12,365 Bbls
of natural gas liquids and 45,997 Bbls of oil.



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Our properties typically have relatively long reserve lives and predictable production profiles. Based on
December 31, 2006 proved reserves and projected 2007 production from properties owned as of December 31, 2006, the average reserve-to-production index of our proved reserves is 16.7 years. The projected 2007 production is from proved
developed producing reserves as of December 31, 2006. In general, our properties have extensive production histories and production enhancement opportunities. While the properties are geographically diversified, the major producing fields are
concentrated within core areas, allowing for substantial economies of scale in production and cost-effective application of reservoir management techniques gained from prior operations. As of December 31, 2006, we owned interests in 20,743
gross (10,812.3 net) producing wells, and we operated wells representing 89% of the present value of cash flows before income taxes (discounted at 10%) from estimated proved reserves. The high proportion of operated properties allows us to exercise
more control over expenses, capital allocation and the timing of development and exploitation activities in our fields.

We have a
substantial inventory of between 6,750 and 7,700 identified potential drilling locations. Drilling plans are primarily dependent upon product prices, the availability and pricing of drilling equipment and supplies, and gathering, processing and
transmission infrastructure.

We employ a disciplined acquisition program refined by senior management to expand our reserve base in core
areas and to add new core areas. Our engineers and geologists use their expertise and experience gained through the management of existing core properties to target properties to be acquired with similar geologic and reservoir characteristics. The
Company then uses its development and technology knowledge to increase the reserves of acquired properties.

We operate gas gathering
systems in several of our core producing areas. We also operate gas processing plants in East Texas, in Texas County, Oklahoma and the Cotton Valley Field of Louisiana. Our gas gathering and processing operations are only in areas where we have
production and are considered activities that facilitate our natural gas production and sales operations.

We market our gas production and
the gas output of our gathering and processing systems. A large portion of our natural gas is processed, and the resultant natural gas liquids are marketed by unaffiliated third parties. We use commodities future contracts, collars and price and
basis swap agreements, fixed-price physical sales and other price risk management instruments to hedge pricing risks.

History of the Company

The Company was incorporated in Delaware in 1990 to ultimately acquire the business and properties of predecessor entities that were
created from 1986 through 1989. Our initial public offering of common stock was completed in May 1993.

During 1991, we formed Cross
Timbers Royalty Trust by conveying a 90% net profits interest in substantially all of the royalty and overriding royalty interests that we then owned in Texas, New Mexico and Oklahoma, and a 75% net profits interest in seven nonoperated working
interest properties in Texas and Oklahoma. Cross Timbers Royalty Trust units are listed on the New York Stock Exchange under the symbol CRT. From 1996 to 1998, we purchased 1,360,000, or 22.7%, of the outstanding units, at a total cost
of $18.7 million. In August 2003, the Board of Directors declared a dividend of 0.0044 units of the trust for each share of our common stock outstanding on September 2, 2003. As a result of this dividend, all of the 1,360,000 trust units were
distributed on September 18, 2003.

In December 1998, we formed the Hugoton Royalty Trust by conveying an 80% net profits interest in
principally gas-producing operated working interests in the Hugoton area of Kansas and Oklahoma, the Anadarko Basin of Oklahoma and the Green River Basin of Wyoming. These net profits interests were conveyed to the trust in exchange for
40 million units of beneficial interest. Hugoton Royalty Trust units are listed on the New York Stock Exchange under the symbol HGT. We sold 17 million units in the trusts initial public offering in 1999 and
1.3 million units pursuant to an employee incentive plan in 1999 and 2000. In January 2006, the Board of Directors declared a dividend of 0.059609 trust units for each share of our common stock outstanding on April 26, 2006. As a result of
this dividend, all of the remaining 21.7 million trust units were distributed on May 12, 2006.



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We also announced in January 2006 that the Company would consider selling its interests in the underlying
properties that are subject to the Cross Timbers Royalty Trust and Hugoton Royalty Trust net profits interests. However, in August 2006, after a full review, we announced that we will retain ownership of these underlying properties at this time.

Industry Operating Environment

The
oil and gas industry is affected by many factors that we generally cannot control. Governmental regulations, particularly in the areas of taxation, energy and the environment, can have a significant impact on operations and profitability. Crude oil
prices are determined by global supply and demand. Oil supply is significantly influenced by production levels of OPEC member countries, while demand is largely driven by the condition of worldwide economies, as well as weather. Natural gas prices
are generally determined by North American supply and demand. Weather has a significant impact on demand for natural gas since it is a primary heating resource. Its increased use for electrical generation has kept natural gas demand elevated
throughout the year, removing some of the seasonal swing in prices. See Significant Events, Transactions and Conditions  Product Prices in Part II, Item 7, Managements Discussion and Analysis of Financial Condition and
Results of Operations, regarding recent price fluctuations and their effect on our results.

Business Strategy

The primary components of our business strategy are:



| | - |  | acquiring long-lived, operated oil and gas properties, including undeveloped leases,
| | - |  | ------------------------------------------------------------------------------------



| | - |  | increasing production and reserves through efficient management of operations and through development, exploitation and exploration activities,
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------



| | - |  | hedging a portion of our production to provide adequate cash flow to fund our development budget and protect the economic return on development projects and
acquisitions, and
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | - |  | retaining management and technical staff that have substantial experience in our core areas.
| | - |  | --------------------------------------------------------------------------------------------

Acquiring Long-Lived, Operated Properties.We seek to acquire long-lived, operated producing properties that:



| | - |  | contain complex, multiple-producing horizons with the potential for increases in reserves and production,
| | - |  | ---------------------------------------------------------------------------------------------------------



| | - |  | produce from nonconventional sources, including tight natural gas reservoirs, coal bed methane and natural gas-producing shale formations,
| | - |  | ------------------------------------------------------------------------------------------------------------------------------------------



| | - |  | are in core operating areas or in areas with similar geologic and reservoir characteristics, and
| | - |  | ------------------------------------------------------------------------------------------------



| | - |  | provide opportunities to improve operating efficiencies.
| | - |  | --------------------------------------------------------

We believe that the properties we acquire provide opportunities to increase production and reserves through the implementation of mechanical and operational improvements, workovers, behind-pipe completions, secondary
recovery operations, new development wells and other development activities. We also seek to acquire facilities related to gathering, processing, marketing and transporting oil and gas in areas where we own reserves. Such facilities can enhance
profitability, reduce costs, and provide marketing flexibility and access to additional markets. Our ability to successfully purchase properties is dependent upon, among other things, competition for such purchases and the availability of financing
to supplement internally generated cash flow.

We also seek to acquire undeveloped properties that potentially have the same attributes as
targeted producing properties.



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Increasing Production and Reserves.A principal component of our strategy is to increase
production and reserves through aggressive management of operations and low-risk development. We believe that our principal properties possess geologic and reservoir characteristics that make them well suited for production increases through
drilling and other development programs. We have generated an inventory of between 6,750 and 7,700 identified potential drilling locations. Additionally, we review operations and mechanical data on operated properties to determine if actions can be
taken to reduce operating costs or increase production. Such actions include installing, repairing and upgrading lifting equipment, redesigning downhole equipment to improve production from different zones, modifying gathering and other surface
facilities and conducting restimulations and recompletions. We may also initiate, upgrade or revise existing secondary recovery operations.

Exploration Activities.During 2007, we plan to focus our exploration activities on projects that are near currently owned productive fields. We believe that we can prudently and successfully add growth potential through exploratory
activities given improved technology, our experienced technical staff and our expanded base of operations. We have allocated approximately $120 million of our $2.4 billion 2007 development budget for exploration activities.

Hedging Activities.To reduce production price risk, we may enter futures contracts, collars and price and basis swap agreements, as well as fixed
price physical delivery contracts. Our policy is to consider hedging a portion of our production at commodity prices management deems attractive. While there is a risk we may not be able to realize the full benefit of rising prices, management plans
to continue its hedging strategy because of the benefits provided by predictable, stable cash flow, including:



| | - |  | ability to more efficiently plan and execute our development program, which facilitates predictable production growth,
| | - |  | ----------------------------------------------------------------------------------------------------------------------



| | - |  | ability to help assure the economic return on acquisitions,
| | - |  | -----------------------------------------------------------



| | - |  | ability to enter long-term arrangements with drilling contractors, allowing us to continue development projects when product prices decline,
| | - |  | --------------------------------------------------------------------------------------------------------------------------------------------



| | - |  | more consistent returns on investment, and
| | - |  | ------------------------------------------



| | - |  | better utilization of our personnel.
| | - |  | ------------------------------------

Experienced Management and Technical Staff.Most senior management and technical staff have worked together for over 20 years and have substantial experience in our core operating areas. Bob R. Simpson, a founder, Chairman and Chief
Executive Officer of the Company, was previously an executive officer of Southland Royalty Company, one of the largest U.S. independent oil and gas producers prior to its acquisition by Burlington Northern, Inc. in 1985.

Other Strategies.We may also acquire working interests in nonoperated producing properties if such interests otherwise meet our acquisition
criteria. We attempt to acquire nonoperated interests in fields where the operators have a significant interest to protect, including potential undeveloped reserves that will be exploited by the operator. We may also acquire nonoperated interests in
order to ultimately accumulate sufficient ownership interests to operate the properties.

We also attempt to acquire a portion of our
reserves as royalty interests. Royalty interests have few operational liabilities because they do not participate in operating activities and do not bear production or development costs.

Royalty Trusts and Publicly Traded Partnerships.We have created and sold units in publicly traded royalty trusts. Sales of royalty trust units
allow us to more efficiently capitalize our mature, lower-growth properties. We may create and distribute or sell interests in additional royalty trusts or publicly traded partnerships in the future.

Business Goals.In January 2007, we announced a strategic goal for 2007 of increasing production by 10% over 2006 levels. To achieve this growth
target, we plan to drill about 1,150 (978 net) development wells and perform approximately 655 (509 net) workovers and recompletions in 2007.



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We have budgeted $2.4 billion for our 2007 development program, which is expected to be funded by cash
flow from operations. We plan to spend approximately $800 million in the Eastern Region, $800 million in the North Texas Region, $290 million in the Permian and South Texas Region, $240 million in the San Juan Region and $150 million in the
Mid-Continent and Rocky Mountain Region and other areas and approximately $120 million for exploration and acreage leasing activities. An additional $200 million has been budgeted for the construction of pipeline, compression and processing
infrastructure that is critical to the transportation and sale of production in several operating regions.

While an acquisition budget has
not been formalized, we plan to actively review additional acquisition opportunities during 2007. If acquisition, development and exploration expenditures exceed cash flow from operations, we expect to obtain additional funding through our bank
credit facilities, our commercial paper program, issuance of public or private debt or equity, or asset sales. Strategic property acquisitions during 2007 may alter the amount currently budgeted for development and exploration. Our total budget for
acquisitions, development and exploration will be adjusted throughout 2007 to focus on opportunities offering the highest rates of return. We also may reevaluate our budget and drilling programs in the event of significant changes in oil and gas
prices. Our ability to achieve production goals depends on the success of our planned drilling programs or property acquisitions made in place of a portion of the drilling program.

Raw material shortages and strong global demand for steel have continued to tighten steel supplies and cause prices to remain high. In response, we have
maintained a higher tubular inventory and have negotiated supply contracts with our vendors to support our development program. While we expect to acquire adequate supplies to complete our development program, a further tightening of steel supplies
could restrain the program, limiting production growth and increasing development costs.

Although drilling rigs have recently been in
short supply throughout the industry, we have secured or contracted to secure the rigs necessary to support our current drilling program.

Acquisitions

During 2002, we acquired predominantly gas-producing properties for a total cost of $354 million. In May 2002, we acquired properties
in the Powder River Basin of Wyoming for $101 million. These properties were immediately exchanged with Marathon Oil Company for properties with the same value in East Texas and Louisiana. In July, we purchased gas-producing properties in the San
Juan Basin of New Mexico for $43 million and in December 2002, we purchased coal bed methane gas-producing properties located in the San Juan Basin of New Mexico for $154 million from J.M. Huber Corporation. The 2002 acquisitions increased reserves
by approximately 330.4 Bcf of natural gas, 2.2 million Bbls of natural gas liquids and 449,000 Bbls of oil.

During 2003, we acquired
predominantly gas-producing properties for a total cost of $624 million. In April 2003, we acquired natural gas and coal bed methane producing properties in the Raton Basin of Colorado, the Hugoton Field of southwestern Kansas and the San Juan Basin
of New Mexico and Colorado for $381 million from Williams of Tulsa, Oklahoma. In June 2003, we acquired coal bed methane and gas-producing properties in the San Juan Basin of New Mexico and Colorado from Markwest Hydrocarbon, Inc. for $51 million.
In October 2003, we announced the completion of property transactions which increased our positions in East Texas, Arkansas and the San Juan Basin of New Mexico for a total cost of $100 million. The 2003 acquisitions increased reserves by
approximately 465.7 Bcf of natural gas, 4.5 million Bbls of natural gas liquids and 2.2 million Bbls of oil.

During 2004, we
acquired proved properties for a total cost of $1.9 billion. In January 2004, we acquired proved properties in East Texas and northwestern Louisiana for $243 million from multiple parties. From February through April, we purchased $223 million of
properties located primarily in the Barnett Shale of North Texas and in the Arkoma Basin. Two of these acquisitions were purchases of corporations that primarily owned producing and nonproducing properties. Purchase accounting adjustments related to
these acquisitions included a $72 million deferred income tax step-up adjustment. During April, we acquired predominantly oil-producing properties in the Permian Basin of West Texas and in the Powder River Basin of Wyoming from ExxonMobil
Corporation for $336 million. In August, we acquired properties from ChevronTexaco Corporation for a purchase price of $958 million, as adjusted for subsequent purchase of properties that were subject to preferential purchase rights. These
properties expanded our operations in our Eastern Region, the Permian Basin and the Mid-Continent Region and added new coal bed methane properties in the Rocky Mountains and a new operating region in South Texas. Our 2004 acquisitions increased
reserves by approximately 716.5 Bcf of natural gas, 2.9 million Bbls of natural gas liquids and 98.2 million Bbls of oil.



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During 2005, we acquired proved properties for a total cost of $1.7 billion. In April 2005, we acquired
Antero Resources Corporation, which operated in the Barnett Shale in the Fort Worth Basin. The purchase price was approximately $689 million. Including $218 million of debt assumed, $225 million recorded on the step-up of deferred taxes and the
assumption of other liabilities, the total purchase price plus liabilities assumed was $1.26 billion. This amount was allocated to assets acquired including approximately $634 million to proved properties, $180 million to unproved properties, $175
million to acquired gas gathering contracts and related gas gathering and pipeline assets, $215 million to goodwill and $57 million to other assets. In May, we acquired proved properties in East Texas and northwestern Louisiana from Plains
Exploration & Production Company for an adjusted purchase price of $336 million. In July 2005, we acquired proved properties in the Permian Basin of West Texas and New Mexico from ExxonMobil Corporation for an adjusted purchase price of
$200 million. Our 2005 acquisitions increased reserves by approximately 803.4 Bcf of natural gas, 2.8 million Bbls of natural gas liquids and 31.1 million Bbls of oil.

During 2006, we acquired proved properties for a total cost of $561 million. In February 2006, we acquired proved and unproved properties in East Texas
and Mississippi from Total E&P USA, Inc. for $300 million. In June 2006, we acquired Peak Energy Resources, Inc., which operated gas-producing properties and owned unproved properties in the Barnett Shale in the Fort Worth Basin. The purchase
price was approximately $108 million. Including $5 million cash for additional leasehold interests and $1 million cash for other transaction costs, $37 million recorded on the step-up of deferred taxes and the assumption of other liabilities, the
purchase price allocated to proved properties was $97 million and unproved properties was $54 million. All 2006 acquisitions are subject to typical post-closing adjustments. Our 2006 acquisitions increased reserves by approximately 157.9 Bcf of
natural gas, 4.2 million Bbls of natural gas liquids and 3.3 million Bbls of oil.

Significant Properties

The following table summarizes proved reserves and discounted present value, before income tax, of proved reserves by major operating areas at
December 31, 2006:



|                                        |  |                 |  |                                                            |  |           |  |                              |  |   |        |  |       |  
|--------------------------------------- |  | --------------- |  | ---------------------------------------------------------- |  | --------- |  | ---------------------------- |  | - | ------ |  | ----- | -
|                                        |  | Proved Reserves |  | DiscountedPresent Valuebefore Income Taxof Proved Reserves | 
|(in millions)                           |  | Gas(Mcf)        |  | Natural GasLiquids(Bbls)                                   |  | Oil(Bbls) |  | Natural GasEquivalents(Mcfe) | 
|Eastern Region                          |  | 3,472.1         |  | 16.0                                                       |  | 10.5      |  | 3,631.0                      |  | $ | 6,551  |  | 40.4  | %
|North Texas Region                      |  | 1,427.9         |  |                                                           |  |          |  | 1,427.9                      |  |   | 1,987  |  | 12.2  | %
|San Juan Region                         |  | 922.9           |  | 35.3                                                       |  | 1.8       |  | 1,145.7                      |  |   | 1,799  |  | 11.1  | %
|Permian and South Texas Region          |  | 299.9           |  | 1.7                                                        |  | 172.3     |  | 1,343.9                      |  |   | 3,735  |  | 23.0  | %
|Mid-Continent and Rocky Mountain Region |  | 818.0           |  |                                                           |  | 15.3      |  | 910.0                        |  |   | 1,908  |  | 11.8  | %
|Other                                   |  | 3.4             |  |                                                           |  | 14.5      |  | 90.1                         |  |   | 248    |  | 1.5   | %
|                                        |  |                 |  |                                                            |  |           |  |                              |  |   |        |  |       |  
|Total                                   |  | 6,944.2         |  | 53.0                                                       |  | 214.4     |  | 8,548.6                      |  | $ | 16,228 |  | 100.0 | %
|                                        |  |                 |  |                                                            |  |           |  |                              |  |   |        |  |       |  

Eastern Region

We began operations in East Texas and northwestern Louisiana in 1998. These properties produce from various formations at depths between 7,000 feet and 14,000 feet. Subsequent acquisitions and development activity
have significantly increased reserves here since we began operations, and we now own an interest in approximately 848,000 gross (600,000 net) acres. Over 40% of our total proved reserves are in this region. We have 2,250 to 2,650 identified
potential drilling locations in this area. In 2005, we expanded our gathering facilities to increase treating capacity to 730,000 Mcf per day. In 2007, we plan to drill between 300 and 350 wells in the Eastern Region.

Our primary focus in the Eastern Region is in the Freestone Trend where we have an interest in approximately 406,000 gross (316,000 net) acres. The trend
consists of the Freestone, Bald Prairie, Oaks, Luna, Teague, Dew, Farrar and Bear Grass fields and was our most active gas development area in 2006. Other areas in the region include the Sabine Uplift and Cotton Valley areas of East Texas and
northwestern Louisiana.



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##### Table of Contents

North Texas Region

Our operations in the Barnett Shale of North Texas began in January 2004 and, with our 2005 acquisition of Antero Resources Corporation and 2006 acquisition of Peak Energy Resources, we are the second largest producer
in the area. We own approximately 214,000 net acres, 44% of which is in the core productive area, 520 producing wells and gas gathering and pipeline assets. We have 1,800 to 2,000 identified potential drilling locations in this area and plan to
drill approximately 280 to 300 wells in 2007. We also own 225,000 Mcf per day of treating capacity allowing us to add new wells as they are completed. An additional 330,000 Mcf per day of treating capacity is planned by first quarter 2008.

San Juan Region

Our San Juan
Region includes properties in the San Juan and Raton Basins of New Mexico and Colorado, as well as properties in the Uinta Basin of Utah. Production is from conventional as well as coal bed methane sources. We have 950 to 1,100 identified potential
drilling locations to develop these complex, multi-pay basins. In 2005, we entered a new tight-gas play in the Piceance Basin of Colorado through a farmout agreement with ExxonMobil, and we are in the process of completing our first two wells of a
four-well commitment in 2006. The third well in this commitment is currently being drilled.

Permian and South Texas Region

The Permian and South Texas Region is made up of properties in West Texas, southeastern New Mexico and South Texas. In both 2004 and 2005, we
significantly expanded our holdings in the area through acquisitions and trades with ChevronTexaco, ExxonMobil, ConocoPhillips and others. Our activities on these properties have increased oil production by returning shut-in wells to production,
optimizing existing well performance, fracture stimulation and drilling. We have also experienced successful results in multiple fields including Yates, University Block 9, Goldsmith, Russell, Prentice and Cornell. We have 1,050 to 1,150 identified
potential drilling locations in this area.

Mid-Continent and Rocky Mountain Region

Our Mid-Continent and Rocky Mountain Region includes fields in Wyoming, Kansas, Oklahoma and Arkansas. We have operations in the Anadarko Basin,
Fontenelle area and the Arkoma Basin. During 2007, we plan to initiate drilling activities in the Fayetteville Shale in Arkansas and the Woodford Shale in Southeast Oklahoma. While most of our production in the Mid-Continent region is from
conventional sources, we recently began developing coal bed methane in the Powder River Basin of Wyoming. We have 700 to 800 identified potential drilling locations in this area. A substantial portion of our properties in the Mid-Continent Region
are subject to an 80% net profits interest conveyed to the Hugoton Royalty Trust in December 1998. We distributed the remaining 21.7 million Hugoton Royalty Trust units owned by us as a dividend to our stockholders in May 2006.

We operate a gathering system and pipeline in Major County, Oklahoma and a gas plant in Texas County, Oklahoma, and its associated gathering system. We
recently completed a gas gathering and water disposal system in the Hartzog Draw area of Wyoming to service our coal bed methane wells.

Reserves

The following terms are used in our disclosures of oil and natural gas reserves. For the complete detailed definitions of proved,
proved developed and proved undeveloped oil and gas reserves applicable to oil and gas registrants, reference is made to Rule 4-10(a)(2)(3)(4) of Regulation S-X of the Securities and Exchange Commission, available at its web site
http://www.sec.gov/about/forms/regs-x.pdf.

Proved reservesEstimated quantities of crude oil, natural gas and natural gas
liquids which, upon analysis of geologic and engineering data, appear with reasonable certainty to be recoverable in the future from known oil and gas reservoirs under existing economic and operating conditions.

Proved developed reservesProved reserves which can be expected to be recovered through existing wells with existing equipment and operating
methods.



7



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##### Table of Contents

Proved undeveloped reservesProved reserves which are expected to be recovered from new wells
on undrilled acreage or from existing wells where a relatively major expenditure is required.

Estimated future net
revenuesAlso referred to herein as estimated future net cash flows. Computational result of applying current prices of oil and gas (with consideration of price changes only to the extent provided by existing contractual
arrangements, other than hedge derivatives) to estimated future production from proved oil and gas reserves as of the date of the latest balance sheet presented, less estimated future expenditures (based on current costs) to be incurred in
developing and producing the proved reserves.

Present value of estimated future net cash flowsThe computational result of
discounting estimated future net revenues at a rate of 10% annually. The present value of estimated future net cash flows after income tax is also referred to herein as standardized measure of discounted future net cash flows or
standardized measure.

The following are estimated quantities of proved reserves and related cash flows as of December 31,
2006, 2005 and 2004:



|                                                                     |  |             |         |      |   |         |  |   |        
|-------------------------------------------------------------------- |  | ----------- | ------- | ---- | - | ------- |  | - | -------
|                                                                     |  | December 31
|(in millions)                                                        |  | 2006        |         | 2005 |   | 2004   
|Proved developed:                                                    |  |             |         |      |   |         |  |   |        
|Gas (Mcf)                                                            |  |             | 4,481.6 |      |   | 4,033.1 |  |   | 3,252.7
|Natural gas liquids (Bbls)                                           |  |             | 40.1    |      |   | 36.5    |  |   | 30.0   
|Oil (Bbls)                                                           |  |             | 167.3   |      |   | 168.5   |  |   | 134.4  
|Mcfe                                                                 |  |             | 5,725.9 |      |   | 5,262.9 |  |   | 4,239.1
|Proved undeveloped:                                                  |  |             |         |      |   |         |  |   |        
|Gas (Mcf)                                                            |  |             | 2,462.6 |      |   | 2,052.5 |  |   | 1,461.8
|Natural gas liquids (Bbls)                                           |  |             | 12.9    |      |   | 10.9    |  |   | 8.5    
|Oil (Bbls)                                                           |  |             | 47.1    |      |   | 40.2    |  |   | 18.1   
|Mcfe                                                                 |  |             | 2,822.7 |      |   | 2,359.3 |  |   | 1,621.2
|Total proved:                                                        |  |             |         |      |   |         |  |   |        
|Gas (Mcf)                                                            |  |             | 6,944.2 |      |   | 6,085.6 |  |   | 4,714.5
|Natural gas liquids (Bbls)                                           |  |             | 53.0    |      |   | 47.4    |  |   | 38.5   
|Oil (Bbls)                                                           |  |             | 214.4   |      |   | 208.7   |  |   | 152.5  
|Mcfe                                                                 |  |             | 8,548.6 |      |   | 7,622.2 |  |   | 5,860.3
|Estimated future net cash flows:                                     |  |             |         |      |   |         |  |   |        
|Before income tax                                                    |  | $           | 32,259  |      | $ | 50,897  |  | $ | 23,605 
|After income tax                                                     |  | $           | 22,008  |      | $ | 34,074  |  | $ | 16,239 
|Present value of estimated future net cash flows, discounted at 10%: |  |             |         |      |   |         |  |   |        
|Before income tax (a)                                                |  | $           | 16,228  |      | $ | 25,816  |  | $ | 12,237 
|After income tax                                                     |  | $           | 10,828  |      | $ | 17,094  |  | $ | 8,402  

---

|(a) | We believe that the discounted present value of estimated future net cash flows before income tax is a useful supplemental disclosure to the standardized measure, or after-tax
amount. While the standardized measure is dependent on the unique tax situation of each company, the pre-tax discounted amount is based on prices and discount factors that are consistent for all companies. Because of this, the pre-tax discounted
amount can be used within the industry and by securities analysts to evaluate estimated future net cash flows from proved reserves on a more comparable basis. The difference between the standardized measure and the pre-tax discounted amount is the
discounted estimated future income tax of $5.40 billion at December 31, 2006, $8.72 billion at December 31, 2005 and $3.84 billion at December 31, 2004.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Miller and Lents, Ltd., an independent petroleum engineering firm, prepared the estimates of our proved reserves and the future net cash flows (and
related present value) attributable to proved reserves at December 31, 2006, 2005 and 2004. As prescribed by the Securities and Exchange Commission, such proved reserves were estimated using oil and gas prices and production and development
costs as of December 31 of each such year, without escalation. None of our natural gas liquid proved reserves are attributable to gas plant ownership.



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Estimated future net cash flows, and the related 10% discounted present value, of year-end 2006 proved
reserves are significantly lower than at year-end 2005 because of lower commodity prices used in estimation of year-end proved reserves partially offset by increased reserves related to acquisitions and development. Year-end 2006 average realized
prices used in the estimation of proved reserves were $5.46 per Mcf for gas, $31.96 per Bbl for natural gas liquids and $55.47 per Bbl for oil. Year-end 2005 product prices were $9.26 per Mcf for gas, $36.33 per Bbl for natural gas liquids and
$57.02 per Bbl for oil. See Note 15 to Consolidated Financial Statements for additional information regarding estimated proved reserves.

Uncertainties are inherent in estimating quantities of proved reserves, including many factors beyond our control. Reserve engineering is a subjective process of estimating subsurface accumulations of oil and gas that cannot be measured in
an exact manner, and the accuracy of any reserve estimate is a function of the quality of available data and the interpretation thereof. As a result, estimates by different engineers often vary, sometimes significantly. In addition, physical factors
such as the results of drilling, testing and production subsequent to the date of an estimate, as well as economic factors such as change in product prices, may justify revision of such estimates. Accordingly, oil and gas quantities ultimately
recovered will vary from reserve estimates.

During 2006, we filed estimates of oil and gas reserves as of December 31, 2005 with the
U.S. Department of Energy on Form EIA-23 and Form EIA-28. These estimates are consistent with the reserve data reported for the year ended December 31, 2005 in Note 15 to Consolidated Financial Statements, with the exception that Form EIA-23
includes only reserves from properties that we operate.

Exploration and Production Data

For the following data, gross refers to the total wells or acres in which we own a working interest and net refers to gross wells
or acres multiplied by the percentage working interest owned by us. Although many wells produce both oil and gas, a well is categorized as an oil well or a gas well based upon the ratio of oil to gas production.

Producing Wells

The following table summarizes
producing wells as of December 31, 2006, all of which are located in the United States:



|      |  |                |  |                   |  |          |  |         |  |          |  |         
|----- |  | -------------- |  | ----------------- |  | -------- |  | ------- |  | -------- |  | --------
|      |  | Operated Wells |  | Nonoperated Wells |  | Total(a)
|      |  | Gross          |  | Net               |  | Gross    |  | Net     |  | Gross    |  | Net     
|Gas   |  | 8,474.5        |  | 7,265.1           |  | 5,258.8  |  | 897.5   |  | 13,733.3 |  | 8,162.6 
|Oil   |  | 2,385.5        |  | 2,093.8           |  | 4,624.2  |  | 555.9   |  | 7,009.7  |  | 2,649.7 
|      |  |                |  |                   |  |          |  |         |  |          |  |         
|Total |  | 10,860.0       |  | 9,358.9           |  | 9,883.0  |  | 1,453.4 |  | 20,743.0 |  | 10,812.3
|      |  |                |  |                   |  |          |  |         |  |          |  |         

---

|(a) | 782.3 gross (517.7 net) gas wells and 13.7 gross (11.4 net) oil wells are dual completions.
|--- | -------------------------------------------------------------------------------------------



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##### Table of Contents

Drilling Activity

The following table summarizes the number of wells drilled during the years indicated. As of December 31, 2006, we were in the process of drilling 580 gross (391.4 net) wells.



|                   |  |                        |  |       |  |       |  |       |  |       |  |      
|------------------ |  | ---------------------- |  | ----- |  | ----- |  | ----- |  | ----- |  | -----
|                   |  | Year Ended December 31
|                   |  | 2006                   |  | 2005  |  | 2004 
|                   |  | Gross                  |  | Net   |  | Gross |  | Net   |  | Gross |  | Net  
|Development wells: |  |                        |  |       |  |       |  |       |  |       |  |      
|Completed as-      |  |                        |  |       |  |       |  |       |  |       |  |      
|Gas wells          |  | 1,148                  |  | 725.1 |  | 791   |  | 499.8 |  | 584   |  | 372.0
|Oil wells          |  | 316                    |  | 169.1 |  | 255   |  | 121.4 |  | 33    |  | 23.9 
|Non-productive     |  | 11                     |  | 3.3   |  | 19    |  | 9.6   |  | 27    |  | 12.4 
|                   |  |                        |  |       |  |       |  |       |  |       |  |      
|Total              |  | 1,475                  |  | 897.5 |  | 1,065 |  | 630.8 |  | 644   |  | 408.3
|                   |  |                        |  |       |  |       |  |       |  |       |  |      
|Exploratory wells: |  |                        |  |       |  |       |  |       |  |       |  |      
|Completed as-      |  |                        |  |       |  |       |  |       |  |       |  |      
|Gas wells          |  | 22                     |  | 8.1   |  | 7     |  | 4.7   |  | 3     |  | 1.4  
|Oil wells          |  |                       |  |      |  |      |  |      |  |      |  |     
|Non-productive     |  | 10                     |  | 7.2   |  | 2     |  | 2.0   |  |      |  |     
|                   |  |                        |  |       |  |       |  |       |  |       |  |      
|Total              |  | 32                     |  | 15.3  |  | 9     |  | 6.7   |  | 3     |  | 1.4  
|                   |  |                        |  |       |  |       |  |       |  |       |  |      
|Total (a)          |  | 1,507                  |  | 912.8 |  | 1,074 |  | 637.5 |  | 647   |  | 409.7
|                   |  |                        |  |       |  |       |  |       |  |       |  |      

---

|(a) | Included in totals are 581 gross (119.5 net) wells in 2006, 472 gross (96.7 net) wells in 2005 and 212 gross (27.3 net) wells in 2004, drilled on nonoperated interests.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Acreage

The
following table summarizes developed and undeveloped leasehold acreage in which we own a working interest as of December 31, 2006. Acreage related to royalty, overriding royalty and other similar interests is excluded from this summary.



|               |  |                       |  |                   |  |       |  |    
|-------------- |  | --------------------- |  | ----------------- |  | ----- |  | ---
|               |  | Developed Acres(a)(b) |  | Undeveloped Acres
|               |  | Gross                 |  | Net               |  | Gross |  | Net
|(in thousands) |  |                       |  |                   |  |       |  |    
|Texas          |  | 992                   |  | 732               |  | 444   |  | 414
|Oklahoma       |  | 567                   |  | 399               |  | 68    |  | 33 
|Arkansas       |  | 580                   |  | 312               |  | 155   |  | 131
|New Mexico     |  | 441                   |  | 291               |  | 33    |  | 28 
|Kansas         |  | 211                   |  | 167               |  |      |  |   
|Louisiana      |  | 123                   |  | 66                |  | 1     |  |   
|Colorado       |  | 107                   |  | 84                |  | 5     |  | 5  
|Wyoming        |  | 75                    |  | 57                |  | 54    |  | 51 
|Utah           |  | 68                    |  | 58                |  | 14    |  | 14 
|Other          |  | 18                    |  | 12                |  | 34    |  | 25 
|               |  |                       |  |                   |  |       |  |    
|               |  |                       |  |                  
|Total          |  | 3,182                 |  | 2,178             |  | 808   |  | 701
|               |  |                       |  |                   |  |       |  |    

---

|(a) | Developed acres are acres spaced or assignable to productive wells.
|--- | -------------------------------------------------------------------

|(b) | Certain acreage in Oklahoma and Texas is subject to a 75% net profits interest conveyed to the Cross Timbers Royalty Trust, and in Oklahoma, Kansas and Wyoming is subject to
an 80% net profits interest conveyed to the Hugoton Royalty Trust.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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Oil and Gas Sales Prices and Production Costs

The following table shows the average sales prices per unit of production and the production expense and taxes, transportation and other expense per Mcfe
for quantities produced for the indicated period:



|                                          |  |                        |       |      |   |       |  |   |      
|----------------------------------------- |  | ---------------------- | ----- | ---- | - | ----- |  | - | -----
|                                          |  | Year Ended December 31
|                                          |  | 2006                   |       | 2005 |   | 2004 
|Average sales prices (a):                 |  |                        |       |      |   |       |  |   |      
|Gas (per Mcf)                             |  | $                      | 7.69  |      | $ | 7.04  |  | $ | 5.04 
|Natural gas liquids (per Bbl)             |  | $                      | 37.03 |      | $ | 34.10 |  | $ | 26.44
|Oil (per Bbl)                             |  | $                      | 60.96 |      | $ | 47.03 |  | $ | 38.38
|                                          |  |                        |      
|Production expense per Mcfe               |  | $                      | 0.88  |      | $ | 0.84  |  | $ | 0.66 
|Production and property taxes per Mcfe    |  | $                      | 0.41  |      | $ | 0.42  |  | $ | 0.30 
|Transportation and other expense per Mcfe |  | $                      | 0.26  |      | $ | 0.21  |  | $ | 0.17 

---

|(a) | The sales prices shown include the effects of hedging. The effect of hedging on gas prices was to increase realized prices by $1.43 in 2006, and to decrease realized prices
by $0.34 in 2005 and $0.52 in 2004. The effect of hedging on oil prices was to increase realized prices by $0.17 in 2006 and to lower realized prices by $5.25 in 2005 and $1.86 in 2004.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Delivery Commitments

Under a production
payment sold in 1998, we committed to deliver 16.0 Bcf beginning approximately September 2006. The committed volumes are in East Texas. As of December 31, 2006, remaining volumes to be delivered under this commitment are 15.0 Bcf. See Note 8 to
Consolidated Financial Statements. The Companys production and reserves are adequate to meet this delivery commitment.

Competition and
Markets

We compete with other oil and gas companies in all aspects of our business, including acquisition of producing properties and
oil and gas leases, marketing of oil and gas, and obtaining goods, services and labor. Some of our competitors have substantially larger financial and other resources. Factors that affect our ability to acquire producing properties include available
funds, available information about the property and our standards established for minimum projected return on investment. Gathering systems are the only practical method for the intermediate transportation of natural gas. Therefore, competition for
natural gas delivery is presented by other pipelines and gathering systems. Competition is also presented by alternative fuel sources, including heating oil, imported liquified natural gas and other fossil fuels. Because of the long-lived, high
margin nature of our oil and gas reserves and managements experience and expertise in exploiting these reserves, management believes that it effectively competes in the market.

Federal and State Laws and Regulations

There are numerous federal and state laws and
regulations governing the oil and gas industry that are often changed in response to the current political or economic environment. Compliance with existing laws often is difficult and costly and may carry substantial penalties for noncompliance.
The following are some specific laws and regulations that may affect us. We cannot predict the impact of these or future legislative or regulatory initiatives.

Federal Regulation of Natural Gas

The interstate transportation and certain sales for resale of natural gas,
including transportation rates charged and various other matters, are subject to federal regulation by the Federal Energy Regulatory Commission. Federal wellhead price controls on all domestic gas were terminated on January 1, 1993, and none of
our gathering systems are currently subject to FERC regulation. On August 8, 2005, Congress enacted the Energy Policy Act of 2005. The Energy Policy Act, among other things, amended the Natural Gas Act to prohibit market manipulation by any
entity, to direct FERC to facilitate market transparency in the market for sale or transportation of physical natural gas in interstate commerce, and to significantly increase the penalties for violations of the Natural Gas Act, the Natural Gas
Policy Act of 1978, or FERC rules, regulations or orders thereunder. We cannot predict the impact of future government regulation on any natural gas facilities.



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Although FERCs regulations should generally facilitate the transportation of gas produced from our
properties and the direct access to end-user markets, the future impact of these regulations on marketing our production or on our gas transportation business cannot be predicted. We, however, do not believe that we will be affected differently than
competing producers and marketers.

Federal Regulation of Oil

Sales of crude oil, condensate and natural gas liquids are not currently regulated and are made at market prices. The net price received from the sale of these products is affected by market transportation costs. A
significant part of our oil production is transported by pipeline. Under rules adopted by FERC effective January 1995, interstate oil pipelines can change rates based on an inflation index, though other rate mechanisms may be used in specific
circumstances. These rules have had little effect on our oil transportation cost.

State Regulation

Oil and gas operations are subject to various types of regulation at the state and local levels. Such regulation includes requirements for drilling
permits, the method of developing new fields, the spacing and operation of wells and waste prevention. The production rate may be regulated and the maximum daily production allowable from oil and gas wells may be established on a market demand or
conservation basis. These regulations may limit production by well and the number of wells that can be drilled.

We may become a party to
agreements relating to the construction or operations of pipeline systems for the transportation of natural gas. To the extent that such gas is produced, transported and consumed wholly within one state, such operations may, in certain instances, be
subject to the states administrative authority charged with regulating pipelines. The rates that can be charged for gas, the transportation of gas, and the construction and operation of such pipelines would be subject to the regulations
governing such matters. Two of our gathering subsidiaries are designated gas utilities and are subject to such state regulations. Certain states have recently adopted regulations with respect to gathering systems, and other states are considering
similar regulations. New regulations have not had a material effect on the operations of our gathering systems, but we cannot predict whether any further rules will be adopted or, if adopted, the effect these rules may have on our gathering systems.

Federal, State or Native American Leases

Our operations on federal, state or Native American oil and gas leases are subject to numerous restrictions, including nondiscrimination statutes. Such operations must be conducted pursuant to certain on-site security regulations and other
permits and authorizations issued by the Bureau of Land Management, Minerals Management Service and other agencies.

Environmental Regulations

Various federal, state and local laws relating to protection of the environment directly impact oil and gas exploration, development
and production operations, and consequently may impact our operations and costs. These laws and regulations govern, among other things, emissions to the atmosphere, discharges of pollutants into waters of the United States, underground injection of
waste water, the generation, storage, transportation and disposal of waste materials, and protection of public health, natural resources and wildlife. These laws and regulations may impose substantial liabilities for noncompliance and for any
contamination resulting from our operations and may require the suspension or cessation of operations in affected areas. In some jurisdictions, the laws and regulations are constantly being revised, creating the potential for delays in development
plans.



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Although we have used operating and disposal practices that were standard in the industry at the time,
petroleum hydrocarbons or wastes may have been disposed of or released onto or under the properties owned or leased by us or on or under other locations where such wastes have been taken for disposal. In addition, petroleum hydrocarbons or wastes
may have been disposed of or released by prior operators of properties we are acquiring as well as by current third party operators of properties in which we have an ownership interest. Properties impacted by any such disposal or releases could be
subject to costly and stringent investigatory or remedial requirements under environmental laws, some of which impose strict, joint and several liability without regard to fault or the legality of the original conduct, including the Comprehensive
Environmental Response, Compensation, and Liability Act, also known as CERCLA or the Superfund law and analogous state laws.

We are committed to environmental protection and believe we are in substantial compliance with applicable environmental laws and regulations. We routinely obtain permits for our facilities and operations in accordance
with the applicable laws and regulations. There are no known issues that have a significant adverse effect on the permitting process or permit compliance status of any of our facilities or operations. We have made and will continue to make
expenditures in our efforts to comply with environmental regulations and requirements. These costs are considered a normal, recurring cost of our ongoing operations and not an extraordinary cost of compliance with government regulations.

We do not anticipate that we will be required under current environmental laws and regulations to expend amounts that will have a material adverse
effect on our financial position or operations. However, due to continuing changes in these laws and regulations and judicial construction of same, we are unable to predict with any reasonable degree of certainty our future costs of complying with
these governmental requirements. We have been able to plan for and comply with new initiatives without materially changing our operating strategies.

We maintain levels of insurance customary in the industry to limit our financial exposure in the event of a substantial environmental claim resulting from sudden, unanticipated and accidental discharges of oil,
produced water or other substances. We are not fully insured against all environmental risks, and no coverage is maintained with respect to any penalty or fine required to be paid by us.

Future Laws and Regulations

The oil and gas industry is highly regulated and, from time to time,
Congress and state legislatures consider broad and sweeping policy changes that may affect the industry. We cannot predict the impact of such future legislative or regulatory initiatives.

Employees

We had 1,939 employees as of
December 31, 2006. We consider our relations with our employees to be good.

Executive Officers of the Company

The executive officers of the Company are elected by and serve until their successors are elected by the Board of Directors.

Bob R. Simpson, 58, was a founder of the Company and has been Chairman and Chief Executive Officer since July 1, 1996. Prior thereto,
Mr. Simpson served as Vice Chairman and Chief Executive Officer or held similar positions with the Company since 1986. Mr. Simpson was Vice President of Finance and Corporate Development (1979-1986) and Tax Manager (1976-1979) of Southland
Royalty Company.

Keith A. Hutton, 48, has been President since May 1, 2005. Prior thereto, Mr. Hutton served as Executive
Vice President-Operations or held similar positions with the Company since 1987. From 1982 to 1987, Mr. Hutton was a Reservoir Engineer with Sun Exploration & Production Company.

Vaughn O. Vennerberg II, 52, has been Senior Executive Vice President and Chief of Staff since May 1, 2005. Prior thereto,
Mr. Vennerberg served as Executive Vice President-Administration or held similar positions with the Company since 1987. Prior to that time, Mr. Vennerberg was employed by Cotton Petroleum Corporation and Texaco Inc. (1979-1986).



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##### Table of Contents

Louis G. Baldwin, 57, has been Executive Vice President and Chief Financial Officer or held
similar positions with the Company since 1986. Mr. Baldwin was Assistant Treasurer (1979-1986) and Financial Analyst (1976-1979) at Southland Royalty Company.

Timothy L. Petrus, 52, has been Executive Vice PresidentAcquisitions since May 1, 2005. Prior thereto, Mr. Petrus served as Senior Vice President-Acquisitions or held similar positions with the
Company since 1988. Prior to that time, Mr. Petrus was employed by Texas American Bank and Exxon Corporation.

Bennie G.
Kniffen, 56, has been Senior Vice President and Controller or held similar positions with the Company since 1986. From 1976 to 1986, Mr. Kniffen held the position of Director of Auditing or similar positions with Southland Royalty Company.



|Item 1A. | RISK FACTORS
|-------- | ------------

The following factors, among others, could cause actual results to differ materially from those contained in forward-looking statements made in this report and presented elsewhere by management from time to time. Such
factors, among others, may have a material adverse effect upon our business, financial condition, and results of operations.

The following
discussion of our risk factors should be read in conjunction with the consolidated financial statements and related notes included herein. Because of these and other factors, past financial performance should not be considered an indication of
future performance.

Oil, natural gas and natural gas liquids prices fluctuate due to a number of uncontrollable factors, and any decline will
adversely affect our financial condition.

Our results of operations depend upon the prices we receive for our oil, natural gas and
natural gas liquids. We sell most of our oil, natural gas and natural gas liquids at current market prices rather than through fixed-price contracts. Historically, the markets for oil, natural gas and natural gas liquids have been volatile and are
likely to remain volatile in the future. The prices we receive depend upon factors beyond our control, which include:



| |  |  | weather conditions;
| | - |  | -------------------



| |  |  | political instability or armed conflict in oil-producing regions, such as current conditions in the Middle East, Nigeria and Venezuela;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the supply of domestic and foreign oil, natural gas and natural gas liquids;
| | - |  | ----------------------------------------------------------------------------



| |  |  | the ability of members of the Organization of Petroleum Exporting Countries to agree upon and maintain oil prices and production levels;
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------



| |  |  | the level of consumer demand;
| | - |  | -----------------------------



| |  |  | worldwide economic conditions;
| | - |  | ------------------------------



| |  |  | the price and availability of alternative fuels;
| | - |  | ------------------------------------------------



| |  |  | domestic and foreign governmental regulations and taxes;
| | - |  | --------------------------------------------------------



| |  |  | the proximity to and capacity of transportation facilities; and
| | - |  | ---------------------------------------------------------------



| |  |  | the effect of worldwide energy conservation measures.
| | - |  | -----------------------------------------------------

Government regulations, such as regulations of natural gas transportation and price controls, can affect product prices in the long term. These external factors and the volatile nature of the energy markets make it
difficult to reliably estimate future prices of oil and natural gas.

To the extent we have not hedged our production, any decline in oil
and natural gas prices adversely affects our financial condition. If the oil and gas industry experiences significant price declines, we may, among other things, be unable to meet our financial obligations or make planned capital expenditures.



14



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Our use of hedging arrangements could result in financial losses or reduce our income.

To reduce our exposure to fluctuations in oil and natural gas prices, we have entered into and expect in the future to enter into hedging arrangements for
a portion of our oil and natural gas production. However, we may not be able to hedge our future production at prices we deem attractive. These hedging arrangements expose us to risk of financial loss in some circumstances, including when:



| |  |  | production is less than expected;
| | - |  | ---------------------------------



| |  |  | the counterparty to the hedging contract defaults on its contract obligations; or
| | - |  | ---------------------------------------------------------------------------------



| |  |  | there is a change in the expected differential between the underlying price in the hedging agreement and actual prices received.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------

In addition, these hedging arrangements may limit the benefit we would otherwise receive from increases in oil and natural gas prices.

We have substantial capital requirements, and we may be unable to obtain needed financing on satisfactory terms.

We make, and will continue to make, substantial capital expenditures for the acquisition, development, exploration and abandonment of our oil and natural
gas reserves. We intend to finance our capital expenditures primarily through cash flow from operations, bank and commercial paper borrowings and public and private equity and debt offerings. Lower oil and natural gas prices, however, would reduce
our cash flow and could affect our access to the capital markets. Costs of exploration and development were $2.1 billion in 2006, $1.4 billion in 2005 and $587 million in 2004. During 2006, we spent $561 million on proved property acquisitions. Our
exploration and development budget for 2007 is $2.4 billion. An additional $200 million has been budgeted for the construction of pipeline, compression and processing infrastructure in 2007.

We believe that, after debt service, we will have sufficient cash from operating activities to finance our exploration and development expenses through
2007. If revenues decrease, however, and we are unable to obtain additional debt or equity financing, we may lack the capital necessary to replace our reserves or to maintain production at current levels.

We have substantial indebtedness and may incur substantially more debt. Any failure to meet our debt obligations would adversely affect our business and financial
condition.

We have incurred substantial debt. As a result of our indebtedness, we will need to use a portion of our cash flow to
pay principal and interest, which will reduce the amount available to finance our operations and other business activities and could limit our flexibility in planning for or reacting to changes in our business and the industry in which we operate.
Our bank revolving credit, term loan and commercial paper indebtedness is at a variable interest rate, and so a rise in interest rates will generate greater interest expense to the extent we do not have applicable interest rate protection hedges.
The amount of our debt may also cause us to be more vulnerable to economic downturns and adverse developments in our business.

Together
with our subsidiaries, we may incur substantially more debt in the future. The indentures governing our outstanding public debt do not contain restrictions on our incurrence of additional indebtedness. To the extent new debt is added to our current
debt levels, the risks resulting from indebtedness could substantially increase.

Our access to the commercial paper market is predicated
on continued acceptable short-term ratings by Standard & Poors and Moodys. Any downgrade in those ratings may impact our borrowing costs as well as our access to the commercial paper market. Additionally, any downgrade to our long-term
ratings could increase our borrowings costs and limit our access to capital markets.

Our ability to meet our debt obligations and other
expenses will depend on our future performance, which will be affected by financial, business, economic, regulatory and other factors, many of which we are unable to control. If our cash flow is not sufficient to service our debt, we may be required
to refinance the debt, sell assets or sell shares of



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common stock on terms that we do not find attractive if it can be done at all. Further, our failure to comply with the financial and other restrictive
covenants relating to our indebtedness could result in a default under the indebtedness, which could adversely affect our business, financial condition and results of operations.

Competition in the oil and natural gas industry is intense, and some of our competitors have greater financial, technological and other resources than we have.

We operate in the highly competitive areas of oil and natural gas acquisition, development, exploitation, exploration and production. The oil and natural
gas industry is characterized by rapid and significant technological advancements and introductions of new products and services using new technologies. We face intense competition from independent, technology-driven companies as well as from both
major and other independent oil and natural gas companies in each of the following areas:



| |  |  | seeking to acquire desirable producing properties or new leases for future exploration;
| | - |  | ---------------------------------------------------------------------------------------



| |  |  | marketing our oil and natural gas production;
| | - |  | ---------------------------------------------



| |  |  | integrating new technologies; and
| | - |  | ---------------------------------



| |  |  | seeking to acquire the equipment and expertise necessary to develop and operate our properties.
| | - |  | -----------------------------------------------------------------------------------------------

Some of our competitors have financial, technological and other resources substantially greater than ours, and some of them are fully integrated oil
companies. These companies may be able to pay more for development prospects and productive oil and natural gas properties and may be able to define, evaluate, bid for and purchase a greater number of properties and prospects than our financial or
human resources permit. Further, these companies may enjoy technological advantages and may be able to implement new technologies more rapidly than we can. Our ability to develop and exploit our oil and natural gas properties and to acquire
additional properties in the future will depend upon our ability to successfully conduct operations, implement advanced technologies, evaluate and select suitable properties and consummate transactions in this highly competitive environment.

The failure to replace our reserves could adversely affect our financial condition.

Our future success depends upon our ability to find, develop or acquire additional oil and natural gas reserves that are economically recoverable. Our
proved reserves generally decline when oil and natural gas are produced unless we continue to conduct successful exploitation, development or exploration activities or acquire properties containing proved reserves, or both. We may not be able to
economically find, develop or acquire additional reserves. Furthermore, while our revenues may increase if oil and natural gas prices increase significantly, our finding costs for additional reserves could also increase.

Reserve estimates depend on many assumptions that may turn out to be inaccurate. Any material inaccuracies in our reserve estimates or underlying assumptions could
cause the quantities and net present value of our reserves to be overstated.

Estimating quantities of proved oil and natural gas
reserves is a complex process. It requires interpretations of available technical data and various assumptions, including assumptions relating to economic factors. Any significant inaccuracies in these interpretations or assumptions or changes of
conditions could cause the quantities and net present value of our reserves to be overstated.

To prepare estimates of economically
recoverable oil and natural gas reserves and future net cash flows, we analyze many variable factors, such as historical production from the area compared with production rates from other producing areas. We also analyze available geological,
geophysical, production and engineering data, and the extent, quality and reliability of this data can vary. The process also involves economic assumptions relating to commodity prices, production costs, severance and excise taxes, capital
expenditures and workover and remedial costs. Actual results most likely will vary from our estimates. Any significant variance could reduce the estimated quantities and present value of reserves shown in this annual report.



16



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You should not assume that the present value of future net cash flows from our proved reserves shown in
this annual report is the current market value of our estimated oil and natural gas reserves. In accordance with Securities and Exchange Commission requirements, we base the estimated discounted future net cash flows from our proved reserves on
prices and costs on the date of the estimate. Actual current and future prices and costs may differ materially from those used in the earlier net present value estimate, and as a result, net present value estimates using current prices and costs may
be significantly less than the earlier estimate which is provided in this annual report.

Property acquisitions are a component of our growth
strategy, and our failure to complete future acquisitions successfully could reduce our earnings and slow our growth.

Our business
strategy has emphasized growth through acquisitions, but we may not be able to continue to identify properties for acquisition or we may not be able to make acquisitions on terms that we consider economically acceptable. There is intense competition
for acquisition opportunities in our industry. Competition for acquisitions may increase the cost of, or cause us to refrain from, completing acquisitions. Our strategy of completing acquisitions is dependent upon, among other things, our ability to
obtain debt and equity financing and, in some cases, regulatory approvals. Our ability to pursue our growth strategy may be hindered if we are not able to obtain financing or regulatory approvals. Our ability to grow through acquisitions and manage
growth will require us to continue to invest in operational, financial and management information systems and to attract, retain, motivate and effectively manage our employees. The inability to effectively manage the integration of acquisitions
could reduce our focus on subsequent acquisitions and current operations, which, in turn, could negatively impact our earnings and growth. Our financial position and results of operations may fluctuate significantly from period to period, based on
whether significant acquisitions are completed in particular periods.

Acquisitions are subject to the uncertainties of evaluating recoverable
reserves and potential liabilities.

Our recent growth is due in part to acquisitions of producing properties, and we expect
acquisitions will continue to contribute to our future growth. Successful acquisitions require an assessment of a number of factors, many of which are beyond our control. These factors include recoverable reserves, exploration potential, future oil
and natural gas prices, operating costs and potential environmental and other liabilities. Such assessments are inexact and their accuracy is inherently uncertain. In connection with our assessments, we perform a review of the acquired properties,
which we believe is generally consistent with industry practices. However, such a review will not reveal all existing or potential problems. In addition, our review may not allow us to become sufficiently familiar with the properties, and we do not
always discover structural, subsurface and environmental problems that may exist or arise. Our review prior to signing a definitive purchase agreement may be even more limited.

We generally are not entitled to contractual indemnification for preclosing liabilities, including environmental liabilities, on acquisitions. Normally,
we acquire interests in properties on an as is basis with limited remedies for breaches of representations and warranties. If material breaches are discovered by us prior to closing, we could require adjustments to the purchase price,
or, if the claims are significant, we or the seller may have a right to terminate the agreement. We could also fail to discover breaches or defects prior to closing and incur significant unknown liabilities, including environmental liabilities, or
experience losses due to title defects, for which we would have limited or no contractual remedies or insurance coverage.

There are risks in
acquiring producing properties, including difficulties in integrating acquired properties into our business, additional liabilities and expenses associated with acquired properties, diversion of management attention, and costs of increased scope,
geographic diversity and complexity of our operations.

Increasing our reserve base through acquisitions is an important part of our
business strategy. Our failure to integrate acquired businesses successfully into our existing business, or the expense incurred in consummating future acquisitions, could result in our incurring unanticipated expenses and losses. In addition, we
may have to assume cleanup or reclamation obligations or other unanticipated liabilities in connection with these acquisitions. The scope and cost of these obligations may ultimately be materially greater than estimated at the time of the
acquisition.

In connection with future acquisitions, the process of integrating acquired operations into our existing operations may
result in unforeseen operating difficulties and may require significant management attention and financial resources that would otherwise be available for the ongoing development or expansion of existing operations.



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Possible future acquisitions could result in our incurring additional debt, contingent liabilities and
expenses, all of which could have a material adverse effect on our financial condition and operating results.

Drilling oil and natural gas wells is
a high-risk activity and subjects us to a variety of factors that we cannot control.

Drilling oil and natural gas wells, including
development wells, involves numerous risks, including the risk that we may not encounter commercially productive oil and natural gas reservoirs. We may not recover all or any portion of our investment in new wells. The presence of unanticipated
pressures or irregularities in formations, miscalculations or accidents may cause our drilling activities to be unsuccessful and result in a total loss of our investment. In addition, we often are uncertain as to the future cost or timing of
drilling, completing and operating wells. Further, our drilling operations may be curtailed, delayed or canceled as a result of a variety of factors, including:



| |  |  | unexpected drilling conditions;
| | - |  | -------------------------------



| |  |  | title problems;
| | - |  | ---------------



| |  |  | restricted access to land for drilling or laying pipeline;
| | - |  | ----------------------------------------------------------



| |  |  | pressure or irregularities in formations;
| | - |  | -----------------------------------------



| |  |  | equipment failures or accidents;
| | - |  | --------------------------------



| |  |  | adverse weather conditions; and
| | - |  | -------------------------------



| |  |  | costs of, or shortages or delays in the availability of, drilling rigs, tubular materials and equipment.
| | - |  | --------------------------------------------------------------------------------------------------------

The marketability of our production is dependent upon transportation and processing facilities over which we may have no control.

The marketability of our production depends in part upon the availability, proximity and capacity of pipelines, natural gas gathering systems and
processing facilities. Any significant change in market factors affecting these infrastructure facilities, as well as any delays in constructing new infrastructure facilities, could harm our business. We deliver oil and natural gas through gathering
systems and pipelines that we do not own. These facilities may be temporarily unavailable due to market conditions or mechanical reasons, or may not be available to us in the future. For example, during 2004, we experienced temporary curtailments of
our natural gas production in the San Juan Basin and in East Texas due to infrastructure limitations and plant closings for maintenance reasons.

We
are subject to complex federal, state and local laws and regulations that could adversely affect our business.

Extensive federal,
state and local regulation of the oil and gas industry significantly affects our operations. In particular, our oil and natural gas exploration, development and production, and our storage and transportation of liquid hydrocarbons, are subject to
stringent environmental regulations. These regulations have increased the costs of planning, designing, drilling, installing, operating and abandoning oil and natural gas wells and other related facilities. These regulations may become more
demanding in the future. Matters subject to regulation include:



| |  |  | discharge permits for drilling operations;
| | - |  | ------------------------------------------



| |  |  | drilling bonds;
| | - |  | ---------------



| |  |  | spacing of wells;
| | - |  | -----------------



| |  |  | unitization and pooling of properties;
| | - |  | --------------------------------------



| |  |  | environmental protection;
| | - |  | -------------------------



| |  |  | reports concerning operations; and
| | - |  | ----------------------------------

| |  |  | taxation.
| | - |  | ---------

Under these laws and
regulations, we could be liable for:



| |  |  | personal injuries;
| | - |  | ------------------



| |  |  | property damage;
| | - |  | ----------------



| |  |  | oil spills;
| | - |  | -----------



| |  |  | discharge of hazardous materials;
| | - |  | ---------------------------------



| |  |  | reclamation costs;
| | - |  | ------------------



| |  |  | remediation and clean-up costs; and
| | - |  | -----------------------------------



| |  |  | other environmental damages.
| | - |  | ----------------------------



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Although we believe that our operations generally comply with applicable laws and regulations, failure to
comply could result in the suspension or termination of our operations and subject us to administrative, civil and criminal penalties. Further, these laws and regulations could change in ways that substantially increase our costs. Any of these
liabilities, penalties, suspensions, terminations or regulatory changes could make it more expensive for us to conduct our business or cause us to limit or curtail some of our operations.

We currently own, lease or expect to acquire, and have in the past owned or leased, numerous properties that have been used for the exploration and
production of oil and natural gas for many years. Although we have used operating and disposal practices that were standard in the industry at the time, petroleum hydrocarbons or wastes may have been disposed or released on or under the properties
owned or leased by us or on or under other locations where such wastes were taken for disposal. In addition, petroleum hydrocarbons or wastes may have been disposed or released by prior operators of properties that we are acquiring as well as by
current third party operators of properties in which we have an ownership interest. Properties impacted by any such disposal or release could be subject to costly and stringent investigatory or remedial requirements under environmental laws, some of
which impose strict joint and several liability without regard to fault or the legality of the original conduct. These laws include the federal Comprehensive Environmental Response, Compensation, and Liability Act, also known as CERCLA
or the Superfund law, the federal Resource Conservation and Recovery Act and analogous state laws. Under these laws and any implementing regulations, we could be required to remediate contaminated properties and take actions to
compensate for damages to natural resources. In addition, it is not uncommon for neighboring landowners and other third parties to file claims for personal injury or property damages allegedly caused by the release of petroleum hydrocarbons or
wastes into the environment. We currently do not expect any remedial obligations imposed under environmental laws to have a significant effect on our operations.

Our operations in the coastal waters of Cook Inlet of Alaska are subject to the federal Oil Pollution Act, which imposes a variety of requirements related to the prevention of oil spills and liability for damages
resulting from such spills in United States waters. The Oil Pollution Act imposes strict joint and several liability on responsible parties for oil removal costs and a variety of public and private damages, including natural resource damages.
Liability limits for offshore facilities require a responsible party to pay all removal costs, plus up to $75 million in other damages. These liability limits do not apply, however, if the spill was caused by gross negligence or willful misconduct
of the party, if the spill resulted from violation of a federal safety, construction or operation regulation, or if the party failed to report the spill or cooperate fully in any resulting cleanup. The Oil Pollution Act also requires a responsible
party at an offshore facility to submit proof of its financial ability to cover environmental cleanup and restoration costs that could be incurred in connection with an oil spill. We believe that our operations are in substantial compliance with Oil
Pollution Act requirements.

The Department of Transportation, through the Office of Pipeline Safety and Research and Special Programs
Administration, has implemented a series of rules requiring operators of natural gas and hazardous liquid pipelines to develop integrity management plans for pipelines that, in the event of a failure, could impact certain high consequence areas.
These rules also require operators to conduct baseline integrity assessments of all applicable pipeline segments located in the high consequence areas. We are currently in the process of identifying all of our pipeline segments that may be subject
to these rules and are developing integrity management plans for all covered pipeline segments. We do not expect to incur significant costs in achieving compliance with these rules.



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Our business involves many operating risks that may result in substantial losses, and insurance may be unavailable
or inadequate to protect us against these risks.

Our operations are subject to hazards and risks inherent in drilling for,
producing and transporting oil and natural gas, such as:



| |  |  | fires;
| | - |  | ------



| |  |  | natural disasters;
| | - |  | ------------------



| |  |  | explosions;
| | - |  | -----------



| |  |  | pressure forcing oil or natural gas out of the wellbore at a dangerous velocity coupled with the potential for fire or explosion;
| | - |  | ---------------------------------------------------------------------------------------------------------------------------------



| |  |  | weather;
| | - |  | --------



| |  |  | failure of oilfield drilling and service tools;
| | - |  | -----------------------------------------------



| |  |  | changes in underground pressure in a formation that causes the surface to collapse or crater;
| | - |  | ---------------------------------------------------------------------------------------------



| |  |  | pipeline ruptures or cement failures; and
| | - |  | -----------------------------------------



| |  |  | environmental hazards such as natural gas leaks, oil spills and discharges of toxic gases.
| | - |  | ------------------------------------------------------------------------------------------

Any of these risks can cause substantial losses resulting from:



| |  |  | injury or loss of life;
| | - |  | -----------------------



| |  |  | damage to and destruction of property, natural resources and equipment;
| | - |  | -----------------------------------------------------------------------



| |  |  | pollution and other environmental damage;
| | - |  | -----------------------------------------



| |  |  | regulatory investigations and penalties;
| | - |  | ----------------------------------------



| |  |  | suspension of our operations; and
| | - |  | ---------------------------------



| |  |  | repair and remediation costs.
| | - |  | -----------------------------

We do
not insure against the loss of oil or natural gas reserves as a result of operating hazards or insure against business interruption. Losses could occur from uninsurable or uninsured risks, or in amounts in excess of existing insurance coverage. The
occurrence of an event that is not fully covered by insurance could harm our financial condition and results of operations.

Terrorist activities and
military and other actions could adversely affect our business.

On September 11, 2001, the United States was the target of
terrorist attacks of unprecedented scope, and the United States and others instituted military action in response. These conditions caused instability in world financial markets and generated global economic instability. The continued threat of
terrorism and the impact of military and other action, including U.S. military operations in Afghanistan and Iraq, will likely lead to continued volatility in crude oil and natural gas prices and could affect the markets for our operations. In
addition, future acts of terrorism could be directed against companies operating in the United States. The U.S. government has issued public warnings that indicate that energy assets might be specific targets of terrorist organizations. These
developments have subjected our operations to increased risks and, depending on their ultimate magnitude, could have a material adverse effect on our business.

We have limited control over the activities on properties we do not operate.

Other companies operate some of the
properties in which we have an interest. We have limited ability to influence or control the operation or future development of these non-operated properties or the amount of capital expenditures that we are required to fund for their operation. Our
dependence on the operator and other working interest owners for these projects and our limited ability to influence or control the operation and future development of these properties could materially adversely affect the realization of our
targeted returns or lead to unexpected future costs.



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##### Table of Contents

|Item 1B. | UNRESOLVED STAFF COMMENTS
|-------- | -------------------------

As of December 31, 2006, we do not have any Securities and Exchange Commission staff comments that have been unresolved for more than 180 days.



|Item 3. | LEGAL PROCEEDINGS
|------- | -----------------

On October 17, 1997, an action, styled United States of America ex rel. Grynberg v. Cross Timbers Oil Company, et al., was filed in the U.S. District Court for the Western District of Oklahoma by Jack J. Grynberg on behalf of
the United States under the qui tam provisions of the U.S. False Claims Act against the Company and certain of our subsidiaries. The plaintiff alleges that we underpaid royalties on natural gas produced from federal leases and lands owned by
Native Americans in amounts in excess of 20% as a result of mismeasuring the volume of natural gas, incorrectly analyzing its heating content and improperly valuing the natural gas during at least the past ten years. The plaintiff seeks treble
damages for the unpaid royalties (with interest, attorney fees and expenses), civil penalties between $5,000 and $10,000 for each violation of the U.S. False Claims Act, and an order for us to cease the allegedly improper measuring practices. This
lawsuit against us and similar lawsuits filed by Grynberg against more than 300 other companies were consolidated in the United States District Court for Wyoming. In October 2002, the court granted a motion to dismiss Grynbergs royalty
valuation claims, and Grynbergs appeal of this decision was dismissed for lack of appellate jurisdiction in May 2003. In response to a motion to dismiss filed by us and other defendants, in October 2006 the district judge held that Grynberg
failed to establish jurisdictional requirements to maintain the action against us and other defendants and dismissed the action for lack of subject matter jurisdiction. Grynberg has filed an appeal of this decision. The district judge did not
dismiss those claims against us pertaining to the royalty value of carbon dioxide. While we are unable to predict the final outcome of this case, we believe that the allegations of this lawsuit are without merit and intend to vigorously defend the
action. Any potential liability from this claim cannot currently be reasonably estimated, and no provision has been accrued in our financial statements.

In June 2001, we were served with a lawsuit styled Price, et al. v. Gas Pipelines, et al.The action was filed in the District Court of Stevens County, Kansas, against us and one of our subsidiaries, along with
over 200 natural gas transmission companies, producers, gatherers and processors of natural gas. The plaintiffs seek to represent a class of plaintiffs consisting of all similarly situated gas working interest owners, overriding royalty owners and
royalty owners either from whom the defendants had purchased natural gas or who received economic benefit from the sale of such gas since January 1, 1974. The allegations in the case are similar to those in the Grynberg case; however,
the Price case broadens the claims to cover all oil and gas leases (other than the federal and Native American leases that are the subject of the Grynberg case). The complaint alleges that the defendants have mismeasured both the
volume and heating content of natural gas delivered into their pipelines, resulting in underpayments to the plaintiffs. The plaintiffs assert a breach of contract claim, negligent or intentional misrepresentation, civil conspiracy, common carrier
liability, conversion, violation of a variety of Kansas statutes and other common law causes of action. The amount of damages was not specified in the complaint. In February 2002, we, along with one of our subsidiaries, were dismissed from the suit
and another subsidiary of the Company was added. A hearing was held in January 2003, and the court held that a class should not be certified. The plaintiffs counsel has filed an amended class action petition, which reduces the proposed class
to only royalty owners, reduces the claims to mismeasurement of volume only, conspiracy, unjust enrichment and accounting, and only applies to gas measured in Kansas, Colorado and Wyoming. The court held an evidentiary hearing in April 2005 to
determine whether the amended class should be certified, and we are awaiting the decision of the court. While we are unable to predict the outcome of this case, we believe that the allegations of this lawsuit are without merit and intend to
vigorously defend the action. Any potential liability from this claim cannot currently be reasonably estimated, and no provision has been accrued in our financial statements.

On August 5, 2003, the Price plaintiffs served one of our subsidiaries with a new original class action petition styled Price, et al. v.
Gas Pipelines, et al. The action was filed in the District Court of Stevens County, Kansas, against natural gas pipeline owners and operators. The plaintiffs seek to represent a class of plaintiffs consisting of all similarly situated gas
royalty owners either from whom the defendants had purchased natural gas or measured natural gas since January 1, 1974 to the present. The new petition alleges the same improper analysis of gas heating content that had previously been alleged
in the Price case discussed above until it was removed from the case by the filing of the amended class action petition. In all other respects, the new petition appears to be identical to the amended class action petition in that it has a
proposed class of only royalty owners, alleges conspiracy, unjust enrichment and accounting, and only applies to gas measured in Kansas, Colorado and Wyoming. The court held an evidentiary hearing in April 2005 to determine whether the amended class
should be certified, and we are awaiting the decision of the court. The amount of damages was not specified in the complaint. While we are unable to predict the outcome of this case, we believe that



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##### Table of Contents

the allegations of this lawsuit are without merit and intend to vigorously defend the action. Any potential liability from this claim cannot currently be
reasonably estimated, and no provision has been accrued in our financial statements.

We are involved in various other lawsuits and certain
governmental proceedings arising in the ordinary course of business. Our management and legal counsel do not believe that the ultimate resolution of these claims, including the lawsuits described above, will have a material effect on our financial
position or liquidity, although an unfavorable outcome could have a material adverse effect on the operations of a given interim period or year.



|Item 4. | SUBMISSION OF MATTERS TO A VOTE OF SECURITY
HOLDERS
|------- | ---------------------------------------------------

There were no matters submitted to a vote of security holders during the fourth quarter of
2006.



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##### Table of Contents

PART II



|Item 5. | MARKET FOR REGISTRANTS COMMON EQUITY AND
RELATED STOCKHOLDER MATTERS
|------- | ---------------------------------------------------------------------

Our common stock is
listed on the New York Stock Exchange and trades under the symbol XTO. The following table sets forth quarterly high and low sales prices and cash dividends declared for each quarter of 2006 and 2005, (as adjusted for the effect of the
May 2006 distribution of the Hugoton Royalty Trust units and the four-for-three stock split effected in March 2005):



|               |  |      |        |     |   |          |  |   |      
|-------------- |  | ---- | ------ | --- | - | -------- |  | - | -----
|               |  |      |        |     |   | Cash    
|               |  | High |        | Low |   | Dividend
|2006           |  |      |        |     |   |          |  |   |      
|First Quarter  |  | $    | 47.544 |     | $ | 38.497   |  | $ | 0.075
|Second Quarter |  |      | 46.140 |     |   | 36.980   |  |   | 0.075
|Third Quarter  |  |      | 48.350 |     |   | 39.400   |  |   | 0.075
|Fourth Quarter |  |      | 50.600 |     |   | 40.000   |  |   | 0.090
|               |  |      |       
|2005           |  |      |        |     |   |          |  |   |      
|First Quarter  |  | $    | 32.932 |     | $ | 23.017   |  | $ | 0.050
|Second Quarter |  |      | 33.968 |     |   | 26.248   |  |   | 0.050
|Third Quarter  |  |      | 44.102 |     |   | 33.718   |  |   | 0.050
|Fourth Quarter |  |      | 45.160 |     |   | 37.228   |  |   | 0.075

The determination of the amount of future dividends, if any, to be declared and paid is at the
sole discretion of the Board of Directors and will depend on our financial condition, earnings and cash flow from operations, the level of our capital expenditures, our future business prospects and other matters the Board of Directors deems
relevant.

In November 2006, the Board of Directors increased our quarterly dividend to $0.09 per common share. On February 20, 2007,
the Board of Directors declared a quarterly dividend of $0.12 per common share, an increase of 33%, payable on April 13, 2007 to stockholders of record on March 30, 2007. On February 16, 2007, we had 1,670 stockholders of record.

In January 2006, the Board of Directors declared a dividend to common stockholders, consisting of all 21.7 million Hugoton Royalty
Trust units owned by us. The dividend ratio of 0.059609 trust units for each common share outstanding was set on the record date of April 26, 2006. The units were distributed on May 12, 2006, when this dividend was recorded at
approximately $1.687 per common share, based on the fair market value of the units on that date.

The following summarizes purchases of our
common stock during fourth quarter 2006:



|         |  |                                |     |  |                             |       |                                                                                 |   |                                                                                   |           
|-------- |  | ------------------------------ | --- |  | --------------------------- | ----- | ------------------------------------------------------------------------------- | - | --------------------------------------------------------------------------------- | ----------
|Month    |  | Total Numberof SharesPurchased |     |  | Average PricePaid per Share |       | Total Number ofShares Purchasedas Part of PubliclyAnnounced Plansor Programs(a) |   | Maximum Number of Shares that May Yet Be
Purchased Under the Plans or Programs(a)
|October  |  |                               |     |  | $                           |      |                                                                                 |  |                                                                                   |           
|November |  | 934                            | (b) |  | $                           | 50.29 |                                                                                 |  |                                                                                   |           
|December |  |                               |     |  | $                           |      |                                                                                 |  |                                                                                   |           
|         |  |                                |     |  |                             |       |                                                                                 |   |                                                                                   |           
|Total    |  | 934                            |     |  | $                           | 50.29 |                                                                                 |  |                                                                                   | 17,766,400
|         |  |                                |     |  |                             |       |                                                                                 |   |                                                                                   |           

---

|(a) | The Company has a repurchase program approved by the Board of Directors in August 2004 for the repurchase of up to 20 million shares of the Companys common stock.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(b) | During the quarter ended December 31, 2006, the Company purchased shares of common stock as treasury shares related to employee income tax withholding obligations upon
vesting of performance shares under the 2004 Stock Incentive plan. These share purchases were not part of a publicly announced program to purchase common shares.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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##### Table of Contents

|Item 6. | SELECTED FINANCIAL DATA
|------- | -----------------------

The following table shows selected financial information for each of the years in the five-year period ended December 31, 2006. Significant producing
property acquisitions in each of the years presented affect the comparability of year-to-year financial and operating data. See Items 1 and 2, Business and Properties, Acquisitions. All weighted average shares and per share data have
been adjusted for the four-for-three stock split effected in March 2005, the five-for-four stock split effected in March 2004 and the four-for-three stock split effected in March 2003. This information should be read in conjunction with Item 7,
Managements Discussion and Analysis of Financial Condition and Results of Operations and the Consolidated Financial Statements at Item 15(a).

(in millions except production, per share and per unit data)



|                                                  |  |      |           |     |      |   |           |      |  |   |           |     |  |      |         |     |  |   |         |    
|------------------------------------------------- |  | ---- | --------- | --- | ---- | - | --------- | ---- |  | - | --------- | --- |  | ---- | ------- | --- |  | - | ------- | ---
|                                                  |  | 2006 |           |     | 2005 |   |           | 2004 |  |   | 2003      |     |  | 2002 |        
|Consolidated Income Statement Data                |  |      |           |     |      |   |           |      |  |   |           |     |  |      |         |     |  |   |         |    
|Revenues:                                         |  |      |           |     |      |   |           |      |  |   |           |     |  |      |         |     |  |   |         |    
|Gas and natural gas liquids                       |  | $    | 3,490     |     |      | $ | 2,787     |      |  | $ | 1,613     |     |  | $    | 1,040   |     |  | $ | 681     |    
|Oil and condensate                                |  |      | 1,002     |     |      |   | 670       |      |  |   | 319       |     |  |      | 135     |     |  |   | 115     |    
|Gas gathering, processing and marketing           |  |      | 86        |     |      |   | 56        |      |  |   | 18        |     |  |      | 13      |     |  |   | 12      |    
|Other                                             |  |      | (2        | )   |      |   | 6         |      |  |   | (2        | )   |  |      | 1       |     |  |   | 2       |    
|                                                  |  |      |           |     |      |   |           |      |  |   |           |     |  |      |         |     |  |   |         |    
|Total Revenues                                    |  | $    | 4,576     |     |      | $ | 3,519     |      |  | $ | 1,948     |     |  | $    | 1,189   |     |  | $ | 810     |    
|                                                  |  |      |           |     |      |   |           |      |  |   |           |     |  |      |         |     |  |   |         |    
|Net Income                                        |  | $    | 1,860     | (a) |      | $ | 1,152     | (b)  |  | $ | 508       | (c) |  | $    | 288     | (d) |  | $ | 186     | (e)
|                                                  |  |      |           |     |      |   |           |      |  |   |           |     |  |      |         |     |  |   |         |    
|Earnings per common share:                        |  |      |           |     |      |   |           |      |  |   |           |     |  |      |         |     |  |   |         |    
|Basic                                             |  | $    | 5.10      |     |      | $ | 3.21      |      |  | $ | 1.53      |     |  | $    | 0.96    | (f) |  | $ | 0.67    |    
|                                                  |  |      |           |     |      |   |           |      |  |   |           |     |  |      |         |     |  |   |         |    
|Diluted                                           |  | $    | 5.03      |     |      | $ | 3.15      |      |  | $ | 1.51      |     |  | $    | 0.95    | (f) |  | $ | 0.66    |    
|                                                  |  |      |           |     |      |   |           |      |  |   |           |     |  |      |         |     |  |   |         |    
|Weighted average common shares outstanding        |  |      | 364.8     |     |      |   | 358.4     |      |  |   | 332.9     |     |  |      | 299.7   |     |  |   | 277.8   |    
|                                                  |  |      |           |     |      |   |           |      |  |   |           |     |  |      |         |     |  |   |         |    
|Cash dividends declared per common share          |  | $    | 0.315     | (g) |      | $ | 0.225     |      |  | $ | 0.090     |     |  | $    | 0.024   | (h) |  | $ | 0.018   |    
|                                                  |  |      |           |     |      |   |           |      |  |   |           |     |  |      |         |     |  |   |         |    
|                                                  |  |      |           |     |     
|Consolidated Statement of Cash Flows Data         |  |      |           |     |      |   |           |      |  |   |           |     |  |      |         |     |  |   |         |    
|Cash provided (used) by:                          |  |      |           |     |      |   |           |      |  |   |           |     |  |      |         |     |  |   |         |    
|Operating activities                              |  | $    | 2,859     |     |      | $ | 2,094     |      |  | $ | 1,217     |     |  | $    | 794     |     |  | $ | 491     |    
|Investing activities                              |  | $    | (3,036    | )   |      | $ | (2,908    | )    |  | $ | (2,518    | )   |  | $    | (1,135  | )   |  | $ | (737    | )  
|Financing activities                              |  | $    | 180       |     |      | $ | 806       |      |  | $ | 1,304     |     |  | $    | 333     |     |  | $ | 254     |    
|                                                  |  |      |           |     |     
|Consolidated Balance Sheet Data                   |  |      |           |     |      |   |           |      |  |   |           |     |  |      |         |     |  |   |         |    
|Property and equipment, net                       |  | $    | 10,824    |     |      | $ | 8,508     |      |  | $ | 5,624     |     |  | $    | 3,312   |     |  | $ | 2,371   |    
|Total assets                                      |  | $    | 12,885    |     |      | $ | 9,857     |      |  | $ | 6,110     |     |  | $    | 3,611   |     |  | $ | 2,648   |    
|Long-term debt                                    |  | $    | 3,451     |     |      | $ | 3,109     |      |  | $ | 2,043     |     |  | $    | 1,252   |     |  | $ | 1,118   |    
|Stockholders equity                              |  | $    | 5,865     |     |      | $ | 4,209     |      |  | $ | 2,599     |     |  | $    | 1,466   |     |  | $ | 908     |    
|                                                  |  |      |           |     |     
|Operating Data                                    |  |      |           |     |      |   |           |      |  |   |           |     |  |      |         |     |  |   |         |    
|Average daily production:                         |  |      |           |     |      |   |           |      |  |   |           |     |  |      |         |     |  |   |         |    
|Gas (Mcf)                                         |  |      | 1,186,330 |     |      |   | 1,033,143 |      |  |   | 834,572   |     |  |      | 668,436 |     |  |   | 513,925 |    
|Natural gas liquids (Bbls)                        |  |      | 11,854    |     |      |   | 10,445    |      |  |   | 7,484     |     |  |      | 6,463   |     |  |   | 5,068   |    
|Oil (Bbls)                                        |  |      | 45,041    |     |      |   | 39,051    |      |  |   | 22,696    |     |  |      | 12,943  |     |  |   | 13,033  |    
|Mcfe                                              |  |      | 1,527,705 |     |      |   | 1,330,121 |      |  |   | 1,015,654 |     |  |      | 784,877 |     |  |   | 622,532 |    
|                                                  |  |      |           |     |     
|Average sales price:                              |  |      |           |     |      |   |           |      |  |   |           |     |  |      |         |     |  |   |         |    
|Gas (per Mcf)                                     |  | $    | 7.69      |     |      | $ | 7.04      |      |  | $ | 5.04      |     |  | $    | 4.07    |     |  | $ | 3.49    |    
|Natural gas liquids (per Bbl)                     |  | $    | 37.03     |     |      | $ | 34.10     |      |  | $ | 26.44     |     |  | $    | 19.99   |     |  | $ | 14.31   |    
|Oil (per Bbl)                                     |  | $    | 60.96     |     |      | $ | 47.03     |      |  | $ | 38.38     |     |  | $    | 28.59   |     |  | $ | 24.24   |    
|                                                  |  |      |           |     |     
|Production expense (per Mcfe)                     |  | $    | 0.88      |     |      | $ | 0.84      |      |  | $ | 0.66      |     |  | $    | 0.58    |     |  | $ | 0.57    |    
|Taxes, transportation and otherexpense (per Mcfe) |  | $    | 0.67      |     |      | $ | 0.63      |      |  | $ | 0.47      |     |  | $    | 0.37    |     |  | $ | 0.25    |    
|                                                  |  |      |           |     |     
|Proved reserves:                                  |  |      |           |     |      |   |           |      |  |   |           |     |  |      |         |     |  |   |         |    
|Gas (Mcf)                                         |  |      | 6,944.2   |     |      |   | 6,085.6   |      |  |   | 4,714.5   |     |  |      | 3,644.2 |     |  |   | 2,881.2 |    
|Natural gas liquids (Bbls)                        |  |      | 53.0      |     |      |   | 47.4      |      |  |   | 38.5      |     |  |      | 34.7    |     |  |   | 25.4    |    
|Oil (Bbls)                                        |  |      | 214.4     |     |      |   | 208.7     |      |  |   | 152.5     |     |  |      | 55.4    |     |  |   | 56.3    |    
|Mcfe                                              |  |      | 8,548.6   |     |      |   | 7,622.2   |      |  |   | 5,860.3   |     |  |      | 4,184.9 |     |  |   | 3,371.9 |    
|                                                  |  |      |           |     |     
|Other Data                                        |  |      |           |     |      |   |           |      |  |   |           |     |  |      |         |     |  |   |         |    
|Ratio of earnings to fixed charges (i)            |  |      | 15.2      |     |      |   | 11.7      |      |  |   | 8.9       |     |  |      | 6.9     |     |  |   | 5.6     |    



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##### Table of Contents

---

|(a) | Includes pre-tax effects of a gain on the distribution of Hugoton Royalty Trust units of $469 million, income tax expense related to enactment of a new State of Texas margin
tax of $34 million and a derivative fair value gain of $102 million.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(b) | Includes pre-tax effects of a derivative fair value gain of $13 million, non-cash performance award compensation of $34 million, and a gain of $10 million on the exchange of
producing properties.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(c) | Includes pre-tax effects of a derivative fair value loss of $12 million, stock-based incentive compensation of $89 million and special bonuses totaling $12 million related to
the ChevronTexaco and ExxonMobil acquisitions. Stock-based incentive compensation includes cash compensation of $22 million related to cash-equivalent performance shares.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(d) | Includes pre-tax effects of a derivative fair value loss of $10 million, a non-cash contingency gain of $2 million, non-cash performance award compensation of $53 million, a
$10 million loss on extinguishment of debt, a $16 million non-cash gain on the distribution of Cross Timbers Royalty Trust units, and a $2 million after-tax gain on adoption of the new accounting standard for asset retirement obligation.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(e) | Includes pre-tax effects of a derivative fair value gain of $3 million, gain on settlement with Enron Corporation of $2 million, non-cash performance award compensation of
$27 million and a $9 million loss on extinguishment of debt.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(f) | Before cumulative effect of accounting change, earnings per share were $0.95 basic and $0.94 diluted.
|--- | -----------------------------------------------------------------------------------------------------

|(g) | Excludes the May 2006 distribution of all of the Hugoton Royalty Trust units owned by the Company to its stockholders as a dividend with a market value of approximately
$1.687 per common share.
|--- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(h) | Excludes the September 2003 distribution of all of the Cross Timbers Royalty Trust units owned by the Company to its stockholders as a dividend with a market value of
approximately $0.09 per common share.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(i) | For purposes of calculating this ratio, earnings are before income tax and fixed charges. Fixed charges include interest costs and the portion of rentals considered to be
representative of the interest factor.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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##### Table of Contents

|Item7. | MANAGEMENTSDISCUSSION AND
ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
|------ | ------------------------------------------------------------------------------------

The following discussion and analysis should be read in conjunction with Item 6, Selected Financial Data, and the Consolidated Financial Statements
at Item 15(a). Unless otherwise indicated, throughout this discussion the term Mcfe refers to thousands of cubic feet of gas equivalent quantities produced for the indicated period, with oil and natural gas liquid quantities
converted to Mcf on an energy equivalent ratio of one barrel to six Mcf.

Overview

Our business is to produce and sell natural gas, natural gas liquids and crude oil from our predominantly southwestern and central U.S. properties, most
of which we operate. Because our gathering, processing and marketing functions are ancillary to our production of natural gas, natural gas liquids and crude oil, we have determined that our business comprises only one industry segment.

In 2006, we achieved the following record financial and operating results:



| | - |  | Average daily gas production was 1.186 Bcf, a 15% increase from 2005, average daily oil production was 45,041 Bbls, a 15% increase from 2005, and average daily
natural gas liquids production was 11,854 Bbls, a 13% increase from 2005.
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | - |  | Year-end proved reserves were 8.55 Tcfe, a 12% increase from year-end 2005.
| | - |  | ---------------------------------------------------------------------------



| | - |  | Net income was $1.86 billion, a 61% increase from 2005, and earnings per basic common share was $5.10, a 59% increase from 2005.
| | - |  | --------------------------------------------------------------------------------------------------------------------------------



| | - |  | Cash flow from operating activities was $2.86 billion, a 37% increase from 2005.
| | - |  | --------------------------------------------------------------------------------



| | - |  | Stockholders equity was $5.87 billion, a 39% increase from year-end 2005.
| | - |  | --------------------------------------------------------------------------



| | - |  | The debt-to-capitalization ratio improved to 37% at year-end from 42.5% at year-end 2005.
| | - |  | -----------------------------------------------------------------------------------------

We achieve production and proved reserve growth primarily through producing property acquisitions, followed by low-risk development generally funded by
cash flow from operating activities. Funding sources for our acquisitions include proceeds from sales of public and private equity and debt, bank or commercial paper borrowings and cash flow from operating activities. Maintaining or improving our
debt-to-capitalization ratio is a primary consideration in selecting our method of acquisition financing. During 2006, we acquired $561 million of proved properties with proved reserves of 157.9 Bcf of natural gas, 4.2 million Bbls of natural
gas liquids and 3.3 million Bbls of oil.

In a trend that began in 2004 and accelerated during 2005 and the first half of 2006,
commodity prices for natural gas, natural gas liquids and oil increased significantly (see Significant Events, Transactions and Conditions Product Prices). The higher prices have led to increased activity in the industry and,
consequently, rising costs. Drilling rig counts are at levels not seen since the last boom in the early 1980s and labor to run the rigs is in short supply. This was further aggravated by the damage in the Gulf of Mexico as a result of the August and
September 2005 hurricanes. These cost trends have put pressure not only on our operating costs but also our capital costs. With the increased activity, there is also increased demand for oil and gas properties which has resulted in higher
acquisition prices. A decline in both oil and natural gas prices during the last half of 2006 has resulted in slightly lower operating costs per Mcfe compared to the first half of 2006, as well as to slowing cost inflation.

Like all oil and gas exploration and production companies, we face the challenge of natural production decline. An oil and gas exploration and production
company depletes part of its asset base with each unit of production. Despite this natural decline, we have been able to grow our production through acquisitions and drilling, adding more reserves than we produce. We also attempt to manage our
natural decline by combining the acquisition of mature properties with shallower decline rates with the drilling of new wells that have higher decline rates. This has allowed us to keep our natural decline rate lower than the industry average.
Future growth will depend on our ability to continue to add reserves in excess of production.



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##### Table of Contents

Our goal for 2007 is to increase production by 10%. To achieve future production and reserve growth, we
will continue to pursue acquisitions that meet our criteria and to complete development projects included in our inventory of between 6,750 and 7,700 identified potential drilling locations. Our 2007 development budget is $2.4 billion. While an
acquisition budget has not been formalized, we plan to actively review additional acquisition opportunities during 2007. We cannot ensure that we will be able to find properties that meet our acquisition criteria and that we can purchase such
properties on acceptable terms (see Liquidity and Capital Resources-Capital Expenditures).

Increased activity in the oil and
gas producing industry has also had an effect on our ability to hire qualified people including not only operational employees, but also all classifications of industry-specific professionals. We continue to find the employees we need to adequately
staff our operations; however, the cost of hiring and the time to fill positions has increased since 2004. Our employee turnover continues to remain low with total turnover of 8.4% in 2006 and 7.1% in 2005.

In the event that our operating cash flow exceeds our development, exploration and acquisition capital needs, we will consider other alternative uses for
this cash including, but not limited to, debt repayment or stock repurchases. In August 2004, the Board of Directors authorized the repurchase of up to 20 million shares of our common stock from time to time in the open market or negotiated
transactions. As of December 31, 2006, 2,233,600 shares have been repurchased under this authorization.

Sales prices for our natural
gas and oil production are influenced by supply and demand conditions over which we have little or no control, including weather and regional and global economic conditions. To provide predictable production growth, we may hedge a portion of our
production at commodity prices management deems attractive to ensure stable cash flow margins to fund our operating commitments and development program. As of February 2007, we have hedged approximately 65% of our first quarter 2007 projected gas
production at an average NYMEX price of $9.34 per Mcf, and 65% of our last nine months 2007 projected gas production at an average NYMEX price of $9.19 per Mcf, and about 80% of our 2007 crude oil production at an average NYMEX price of $74.40 per
Bbl. Our average realized price on hedged production will be lower than these average NYMEX prices because of location, quality and other adjustments.

The combined effect of higher product prices, a 15% increase in gas production and a 15% increase in oil production resulted in a 30% increase in total revenues to $ 4.58 billion in 2006 from $3.52 billion in 2005. On
an Mcfe produced basis, total revenues were $8.21 in 2006, a 13% increase from $7.25 in 2005.



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##### Table of Contents

We analyze, on an Mcfe produced basis, expenses that generally trend with changes in production:



|                                                         |  |      |      |      |   |                    |  |      
|-------------------------------------------------------- |  | ---- | ---- | ---- | - | ------------------ |  | -----
|                                                         |  | 2006 |      | 2005 |   | Increase(Decrease)
|Production                                               |  | $    | 0.88 |      | $ | 0.84               |  | 5%   
|Taxes, transportation and other                          |  |      | 0.67 |      |   | 0.63               |  | 6%   
|Depreciation, depletion and amortization                 |  |      | 1.57 |      |   | 1.35               |  | 16%  
|Accretion of discount in asset retirement obligation     |  |      | 0.03 |      |   | 0.02               |  | 50%  
|General and administrative, excluding stock compensation |  |      | 0.22 |      |   | 0.25               |  | (12%)
|Interest                                                 |  |      | 0.32 |      |   | 0.31               |  | 3%   
|                                                         |  |      |      |      |   |                    |  |      
|                                                         |  | $    | 3.69 |      | $ | 3.40               |  | 9%   
|                                                         |  |      |      |      |   |                    |  |      

Production expense per Mcfe rose 5% primarily because of increased maintenance and workover costs
and the higher cost of electricity. Taxes, transportation and other expense generally is based on product revenues, and the 6% increase in this expense per Mcfe is primarily caused by increased transportation and other expense as a result of higher
product prices. The 16% increase in depreciation, depletion and amortization per Mcfe resulted from higher acquisition, development and infrastructure costs. The 12% decrease in all other general and administrative expense per Mcfe is because of
increased production outpacing personnel and other costs related to Company growth.

Significant expenses that generally do not trend with
production include:

Stock compensation.Stock compensation expense was $63 million in 2006 compared to $34 million in 2005.
Increased stock compensation is primarily related to expensing stock options upon adoption of Statement of Financial Accounting Standards No. 123R, Share-Based Payment, as of January 1, 2006. Before that date, stock compensation
expense was generally related to performance share awards.

Derivative fair value (gain) loss.This is the net realized and
unrealized gain or loss on derivative financial instruments that does not qualify for hedge accounting treatment and fluctuates based on changes in the fair value of underlying commodities. The net derivative fair value gain was $102 million in 2006
compared to $13 million in 2005.

Our primary sources of liquidity are cash flow from operating activities, borrowings under either our
revolving credit agreement, our commercial paper program, or our other unsecured and uncommitted lines of credit and public and private offerings of equity and debt. We attempt to balance variable rate debt, fixed rate debt and debt maturities to
manage interest cost, interest rate volatility and financing risk (See Liquidity and Capital Resources  Financing).



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##### Table of Contents

Significant Events, Transactions and Conditions

The following events, transactions and conditions affect the comparability of results of operations and financial condition for each of the years ended
December 31, 2006, 2005 and 2004 and may impact future operations and financial condition.

Acquisitions.We acquired proved and unproved
properties at a total cost of $786 million in 2006 and $2 billion per year in both 2005 and 2004, which were funded by a combination of proceeds from sales of common stock and senior notes, bank borrowings and cash flow from operating activities.
The following are significant acquisitions in each of these years:



|             |  |                  |  |                                         |  |   |                  |     |  |                                                                               
|------------ |  | ---------------- |  | --------------------------------------- |  | - | ---------------- | --- |  | ------------------------------------------------------------------------------
|Closing Date |  | Seller           |  | Amount (in millions)                    |  |   | Acquisition Area
|2006         |  | February         |  | Total E&P USA, Inc.                     |  | $ | 300              |     |  | East Texas and Mississippi                                                    
|             |  | June             |  | Peak Energy Resources Inc.              |  |   | 151              | (a) |  | Barnett Shale of North Texas                                                  
|2005         |  | April            |  | Antero Resources Corporation            |  |   | 814              | (b) |  | Barnett Shale of North Texas                                                  
|             |  | May              |  | Plains Exploration & Production Company |  |   | 336              |     |  | East Texas and northwestern Louisiana                                         
|             |  | July             |  | ExxonMobil Corporation                  |  |   | 200              |     |  | Permian Basin of West Texas and New Mexico                                    
|2004         |  | January          |  | Multiple parties                        |  |   | 243              |     |  | East Texas and northwestern Louisiana                                         
|             |  | February - April |  | Multiple parties                        |  |   | 223              |     |  | Barnett Shale of North Texas and Arkoma Basin                                 
|             |  | April            |  | ExxonMobil Corporation                  |  |   | 336              |     |  | Permian Basin of West Texas and Powder River Basin of Wyoming                 
|             |  | August           |  | ChevronTexaco Corporation               |  |   | 958              |     |  | Eastern Region, Permian Basin, Mid- Continent, Rocky Mountains and South Texas

---

|(a) | Represents a portion of the allocated purchase price of Peak Energy Resources, Inc. and includes an allocation of $97 million to proved properties and $54 million to unproved
properties. See Note 13 to the Consolidated Financial Statements.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(b) | Represents a portion of the allocated purchase price of Antero Resources Corporation and includes an allocation of $634 million to proved properties and $180 million to
unproved properties. See Note 13 to the Consolidated Financial Statements.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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##### Table of Contents

2006, 2005 and 2004 Development and Exploration Programs.Gas development focused on the Eastern and North Texas
Regions during 2006 and 2005 and on the Eastern and Mid-Continent Regions in 2004. Oil development was concentrated primarily in the Permian Region during all three years. Development costs totaled $2.02 billion in 2006, $1.34 billion in 2005 and
$570 million in 2004. Exploration activity in 2006 and 2005 was primarily drilling and geological and geographical analysis, including seismic studies of underdeveloped properties in the North Texas Region. Exploration activity in 2004 was primarily
geological and geophysical analysis, including seismic studies of undeveloped properties. Exploratory costs were $123 million in 2006, $52 million in 2005 and $17 million in 2004. Our development and exploration activities are generally funded by
cash flow from operations.

2007 Acquisition, Development and Exploration Program.We have budgeted $2.4 billion for our 2007 development and
exploration program, which we expect to fund using cash flow from operations. While an acquisition budget has not been formalized, we plan to continue to actively review additional acquisition opportunities during 2007. If acquisition, development
and exploration expenditures exceed cash flow from operations, we expect to obtain additional funding through our bank credit facilities, our commercial paper program, public or private issuance of debt or equity, or asset sales. The cost of 2007
property acquisitions may alter the amount currently budgeted for development and exploration. Our total budget for acquisitions, development and exploration will be adjusted throughout 2007 to focus on opportunities offering the highest rates of
return.

As of December 31, 2006, we have an inventory of between 6,750 and 7,700 identified potential drilling locations. We plan to
drill about 1,150 (978 net) development wells and perform approximately 655 (509 net) workovers and recompletions in 2007. Drilling plans are dependent upon product prices.

Product Prices. In addition to supply and demand, oil and gas prices are affected by seasonal, political and other conditions we generally cannot control or predict.

Gas.Natural gas prices are affected by weather, the U.S. economy, the level of North American production, crude oil prices and import levels of
liquified natural gas. Natural gas competes with alternative energy sources as fuel for heating and the generation of electricity. Since late 2002, gas prices have generally been increasing due primarily to increased demand and declining North
American production. These trends accelerated in the second half of 2005 due to the effects of hurricanes on Gulf of Mexico production with gas prices reaching a peak in excess of $15.00 per MMBtu. During most of 2006, gas prices have trended lower
primarily because of an adequate natural gas supply inventory due to the warmer than normal weather during the winter of 2005-2006 and the absence of hurricane activity in the Gulf of Mexico in 2006. Much colder temperatures during February 2007
have caused prices to partially rebound. We expect prices to remain volatile. As described under Hedging Activities below, we use commodity price hedging instruments to reduce our exposure to gas price fluctuations. The following are
comparative average gas prices for the last three years:



|                                               |  |                        |      |      |   |      |  |   |     
|---------------------------------------------- |  | ---------------------- | ---- | ---- | - | ---- |  | - | ----
|                                               |  | Year Ended December 31
|(per Mcf)                                      |  | 2006                   |      | 2005 |   | 2004
|Average NYMEX price                            |  | $                      | 7.23 |      | $ | 8.62 |  | $ | 6.14
|Average realized sales price                   |  | $                      | 7.69 |      | $ | 7.04 |  | $ | 5.04
|Average realized sales price excluding hedging |  | $                      | 6.26 |      | $ | 7.38 |  | $ | 5.56

At February 15, 2007, the average NYMEX gas price for the following 12 months was $8.09 per
MMBtu. As computed on an energy equivalent basis, our proved reserves were 81% natural gas at December 31, 2006. After considering hedges in place as of February 15, 2007, we estimate that a $0.10 per Mcf change in the average gas sales
price would result in approximately a $14 million change in 2007 annual operating cash flow before income taxes.



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Oil. Crude oil prices are generally determined by global supply and demand. Since late 2002, oil
prices have generally been rising primarily because of increasing global demand and supply shortage concerns, inadequate sour crude refining capacity, reduced production as a result of tropical storms and hurricanes in the Gulf of Mexico in 2005 and
political instability. Amid rising tension in the Middle East, oil prices increased to record levels in July 2006, exceeding $78.00 per Bbl. Rising crude oil supplies, reduced geopolitical tension and the potential for lower demand in a slowing U.S.
economy have caused recent oil prices to fluctuate between $50 and $60 per Bbl. We expect oil prices to remain volatile. As described under Hedging Activities below, we use commodity price hedging instruments to reduce our exposure to
oil price fluctuations. The following are comparative average oil prices for the last three years:



|                                               |  |                        |       |      |   |       |  |   |      
|---------------------------------------------- |  | ---------------------- | ----- | ---- | - | ----- |  | - | -----
|                                               |  | Year Ended December 31
|(per Bbl)                                      |  | 2006                   |       | 2005 |   | 2004 
|Average NYMEX price                            |  | $                      | 66.22 |      | $ | 56.57 |  | $ | 41.38
|Average realized sales price                   |  | $                      | 60.96 |      | $ | 47.03 |  | $ | 38.38
|Average realized sales price excluding hedging |  | $                      | 60.79 |      | $ | 52.28 |  | $ | 40.24

At February 15, 2007, the average NYMEX oil price for the following 12 months was $60.56 per
Bbl. After considering hedges in place as of February 15, 2007, we estimate that a $1.00 per barrel change in the average oil sales price would result in approximately a $4 million change in 2007 annual operating cash flow before income taxes.

Gulf of Mexico Hurricanes. In late August and September 2005, hurricanes in the Gulf of Mexico disrupted a significant portion of U.S. oil and gas
production, leading to higher and more volatile commodity prices. The Companys field operations and production were substantially unaffected by these hurricanes. Production expense and development costs, however, increased throughout the
industry because of storm damages and related supply shortages and higher insurance costs.

Hedging Activities.We may enter futures contracts,
collars and basis swap agreements, as well as fixed price physical delivery contracts, to hedge our exposure to product price volatility. Our policy is to consider hedging a portion of our production at commodity prices management deems attractive.
While there is a risk we may not be able to realize the full benefit of rising prices, management plans to continue its hedging strategy because of the benefits of predictable, stable cash flows.

In 2006, all hedging activities increased gas revenue by $618 million and increased oil revenue by $3 million, while in 2005, all hedging activities
decreased gas revenue by $127 million and decreased oil revenue by $75 million. In 2004, hedging activities decreased gas revenue by $156 million and decreased oil revenue by $15 million.

The following summarizes our 2007 and 2008 NYMEX hedging positions as of February 2007, excluding basis adjustments. Our average daily production was
1.230 Bcf of gas and 45,997 Bbls of oil in fourth quarter 2006. Prices to be realized for hedged production will be less than these NYMEX prices because of location, quality and other adjustments. See Note 8 to the Consolidated Financial Statements.



|                  |  |                                       |  |                             |  |   |     
|----------------- |  | ------------------------------------- |  | --------------------------- |  | - | ----
|                  |  | Futures Contracts and Swap Agreements
|                  |  | Natural Gas                          
|Production Period |  | Mcf per Day                           |  | Average NYMEX Price per
Mcf
|2007              |  | January                               |  | 700,000                     |  | $ | 9.55
|                  |  | February                              |  | 800,000                     |  | $ | 9.33
|                  |  | March to December                     |  | 900,000                     |  | $ | 9.19



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|                         |           |                                       |  |                             |       |  | 
|------------------------ | --------- | ------------------------------------- |  | --------------------------- | ----- |  | 
|                         |           | Futures Contracts and Swap Agreements
|                         | Crude Oil
|Production Period        |           | Bbls per Day                          |  | Average NYMEX Price per
Bbl
|2007 January to December |           | 37,500                                |  | $                           | 74.40
|2008 January to December |           | 22,500                                |  | $                           | 74.26

Derivative Fair Value (Gain) Loss.We record in our income statements realized and unrealized derivative
fair value gains and losses related to derivatives that do not qualify for hedge accounting, as well as the ineffective portion of hedge derivatives. We recorded net derivative fair value gains of $102 million in 2006 and $13 million in 2005, and a
net loss of $12 million in 2004. The 2006 gain includes a $67 million gain on the ineffective portion of hedge derivatives, or approximately 5% of total hedge derivative gains. The 2005 gain includes a $1 million loss on the ineffective portion of
hedge derivatives, or approximately 1% of total hedge derivative losses. The 2004 loss includes a $12 million loss on the ineffective portion of hedge derivatives, or approximately 8% of total hedge derivative losses. These ineffective hedge
derivative gains and losses are primarily because of fluctuating oil and gas prices and their effect on hedges of production in areas without corresponding basis or location differential swap contracts.

Derivative fair value (gain) loss includes a net gain related to our Btu swap contracts of $16 million in 2006 and net losses of $23 million in 2005 and
$1 million in 2004. The remaining portion of these contracts was terminated as of February 28, 2006.

Unrealized derivative gains and
losses associated with effective cash flow hedges are recorded in stockholders equity as accumulated other comprehensive income. At December 31, 2006, we have an unrealized pre-tax gain of $775 million in accumulated other comprehensive
income related to the fair value of derivatives designated as cash flow hedges of gas and crude oil price risk. Based on December 31 mark-to-market prices, $722 million of this fair value gain is expected to be reclassified into earnings in
2007. The actual reclassification to earnings will be based on mark-to-market prices at contract settlement date.

Stock-Based Compensation.Beginning in 2006, stock compensation includes expensing for stock options related to the adoption of SFAS No. 123R. Before 2006, stock compensation was generally a result of performance share award vesting as our common stock price
increased. Stock compensation totaled $63 million in 2006, $34 million in 2005 and $89 million in 2004. Included in stock option expense in 2006 is $36 million related to options granted in the second quarter which were subject to accelerated
vesting provisions upon retirement under employment agreements for certain employees. As required under SFAS No. 123R, stock option awards subject to such vesting provisions granted to retirement-eligible employees are expensed upon grant,
rather than over the expected vesting period. Stock compensation in 2005 and 2004 primarily related to increases in our stock price of 66% in 2005 and 56% in 2004. Included in 2004 incentive compensation is $22 million of cash compensation related
to vesting of cash-equivalent performance shares. Otherwise, stock compensation was non-cash. As of December 31, 2006, stock compensation expense is expected to total $47 million in 2007, $34 million in 2008, and $17 million in 2009 related to
all outstanding stock awards.

Hugoton Royalty Trust Distribution. In January 2006, the Board of Directors declared a dividend to common
stockholders, consisting of all 21.7 million Hugoton Royalty Trust units owned by us. The dividend ratio of 0.059609 trust units for each common share outstanding was set on the record date of April 26, 2006. The units were distributed on
May 12, 2006, when this dividend was recorded. We recorded this dividend at $614 million, or approximately $1.687 per common share, the fair market value of the units based on the May 12, 2006 average high and low New York Stock Exchange
trade price of $28.31. After considering the cost of the trust units, we recorded a gain on distribution of $469 million before income tax.



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Senior Note Offerings. In January 2004, we sold $500 million of 4.9% senior notes due February 2014. In September
2004, we sold $350 million of 5% senior notes due in January 2015. In April 2005, we sold $400 million of 5.3% senior notes due June 2015. In March 2006, we sold $400 million of 5.65% senior notes due April 2016 and $600 million of 6.1% senior notes
due April 2036. Proceeds from the senior notes were used to fund property acquisitions and reduce bank debt.

Common Stock Transaction.In May 2004,
we completed a public offering of 32 million shares of common stock at $18.92 per share. Net proceeds of $580 million were used to reduce bank borrowings that funded our producing property acquisitions from ExxonMobil Corporation and our
deposit on the ChevronTexaco acquisition.

Shelf Registration Statement. In June 2006, we filed a shelf registration statement with the Securities
and Exchange Commission to potentially offer securities which could include debt securities or common stock. The securities will be offered at prices and on terms to be determined at the time of sale. Net proceeds from the sale of such securities
are to be used for general corporate purposes, including the reduction of bank debt.

In June 2006, we registered 2.555 million shares
of our common stock, which were issued in the acquisition of Peak Energy Resources on June 30, 2006.

Results of Operations

2006 Compared to 2005

For the year 2006, net
income was $1.86 billion compared with net income of $1.15 billion for 2005. Earnings for 2006 include the net after-tax effects of a $295 million gain on the distribution of Hugoton Royalty Trust units, a $65 million fair value gain on certain
derivatives that do not qualify for hedge accounting and $34 million of income tax expense related to enactment of a new State of Texas margin tax. Earnings for 2005 include the net after-tax effects of non-cash incentive compensation of $22
million, an $8 million derivative fair value gain on certain derivatives that do not qualify for hedge accounting, and a gain of $6 million on the exchange of producing properties.

Revenues for 2006 were $4.58 billion, or 30% higher than 2005 revenues of $3.52 billion. Gas and natural gas liquids revenue increased $703 million, or
25%, because of a 15% increase in gas production and a 9% increase in gas prices from an average of $7.04 per Mcf in 2005 to $7.69 in 2006, as well as a 13% increase in natural gas liquids production and a 9% increase in natural gas liquids prices
from an average price of $34.10 per Bbl in 2005 to $37.03 in 2006 (see Significant Events, Transactions and Conditions  Product Prices  Gas above). Increased production was attributable to the 2006 acquisition and development
program.

Oil revenue increased $332 million, or 50%, because of a 15% increase in production, primarily due to the 2006 acquisition and
development program, and a 30% increase in oil prices from an average of $47.03 per Bbl in 2005 to $60.96 in 2006 (see Significant Events, Transactions and Conditions  Product Prices  Oil above).

Gas gathering, processing and marketing activities resulted in a contribution of $45 million in both 2006 and 2005. In 2005, other revenues of $6 million
were primarily related to a net gain on sale or exchange of producing properties. See Note 13 to Consolidated Financial Statements.

Expenses for 2006 totaled $1.9 billion as compared with total 2005 expenses of $1.56 billion. Increased expenses are generally related to increased production from acquisitions and development and related Company growth. Production expense
increased $85 million, or 21%, primarily because of increased overall production, and higher labor, fuel, compression and maintenance costs. The per Mcfe production expense increase from $0.84 in 2005 to $0.88 in 2006 is primarily attributable to
the increased maintenance and workover costs and the higher cost of electricity. Taxes, transportation and other expense, which is generally based on product revenue, increased 22%, or $66 million, primarily because of increased transportation and
other expense related to higher product prices. Taxes, transportation and other per Mcfe increased 6% from $0.63 in 2005 to $0.67 in 2006 primarily due to increased transportation and other expense as a result of higher product prices. Exploration
expense decreased $2 million primarily because of decreased seismic work in the Barnett Shale.

Depreciation, depletion and amortization
(DD&A) increased $220 million, or 34%, primarily because of increased production. On an Mcfe basis, DD&A increased 16% from $1.35 in 2005 to $1.57 in 2006 because of higher acquisition, development and infrastructure costs.



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General and administrative expense increased $34 million (22%). Excluding a $24 million decrease in
non-cash performance and restricted share award compensation related to performance and restricted share grants to employees and a $53 million charge for expensing stock options related to the adoption of SFAS No. 123R in 2006, general and
administrative expense increased $5 million (4%). Increased general and administrative expense is primarily because of higher employee expenses related to Company growth. Included in stock option expense in the 2006 period is $36 million related to
options granted in the second quarter which were subject to accelerated vesting provisions upon retirement under employment agreements for certain employees. As required under SFAS No. 123R, stock option awards subject to such vesting
provisions granted to retirement-eligible employees are expensed upon grant, rather than over the expected vesting period. Excluding stock compensation, general and administrative expense per Mcfe decreased 12% from $0.25 in 2005 to $0.22 in 2006.

The derivative fair value gain for 2006 was $102 million compared to $13 million in 2005. The 2006 gain is primarily related to the
ineffective portion of hedge derivatives as well as a $16 million gain on the final settlement of Btu swap contracts. The 2005 gain is primarily because of a $37 million gain related to natural gas basis swap agreements not qualifying for hedge
accounting, partially offset by losses on Btu swap contracts. See Note 7 to Consolidated Financial Statements.

Interest expense increased
$27 million, or 18%, primarily because of a 14% increase in the weighted average borrowings to partially fund property acquisitions and a 10% increase in the weighted average interest rate due to increases in short-term rates. Interest expense per
Mcfe increased 3% from $0.31 in 2005 to $0.32 in 2006.

The 2006 effective income tax rate was 37.2%, as compared with a 36.3% effective
rate for 2005. Excluding the effect of the $34 million income tax expense related to a new State of Texas margin tax enacted during second quarter, the effective tax rate for the 2006 period was 36%. The lower rate in 2006 is because of the benefit
of certain nonrecurring permanent tax over book differences which was partially offset by increased income taxes in states other than Texas. Because of increased profit in 2006 and greater utilization of net operating loss carryforwards in 2005, the
current portion of total income tax expense increased from 37% in 2005 to 52% in 2006.

2005 Compared to 2004

For the year 2005, net income was $1.15 billion compared with net income of $508 million for 2004. Earnings for 2005 include the net after-tax effects of
non-cash incentive compensation of $22 million, an $8 million derivative fair value gain, and a gain of $6 million on the exchange of producing properties. Earnings for 2004 include the net after-tax effects of stock-based incentive compensation of
$55 million, special bonuses totaling $12 million related to acquisitions announced in second quarter 2004, and a $7 million derivative fair value loss.

Revenues for 2005 were $3.52 billion, or 81% higher than 2004 revenues of $1.95 billion. Gas and natural gas liquids revenue increased $1.17 billion, or 73%, because of a 23% increase in gas production and a 40%
increase in gas prices from an average of $5.04 per Mcf in 2004 to $7.04 in 2005, as well as a 39% increase in natural gas liquids production and a 29% increase in natural gas liquids prices from an average price of $26.44 per Bbl in 2004 to $34.10
in 2005 (see Significant Events, Transactions and Conditions  Product Prices  Gas above). Increased production was attributable to the 2005 acquisition and development program.

Oil revenue increased $351 million, or 110%, because of a 72% increase in production, primarily due to acquisitions, and a 23% increase in oil prices
from an average of $38.38 per Bbl in 2004 to $47.03 in 2005 (see Significant Events, Transactions and Conditions  Product Prices  Oil above). Gas gathering, processing and marketing revenues increased $38 million primarily
because of new gathering assets included in the Antero Resources acquisition and increased volumes, margins and prices. In 2005, other revenues of $6 million were primarily related to a net gain on sale or exchange of producing properties. See Note
13 to Consolidated Financial Statements.

Expenses for 2005 totaled $1.56 billion as compared with total 2004 expenses of $1.03 billion.
Increased expenses are generally related to increased production from acquisitions and development and related Company growth. Production expense increased $160 million, or 65%, primarily because of increased overall production, higher labor, fuel,
workover and maintenance costs and the 72% increase in oil production, which is more expensive per Mcfe to produce than natural gas. The per Mcfe production expense increase from $0.66 in 2004 to $0.84 in 2005 is primarily attributable to the
increase in oil production, and also because of increased maintenance and labor costs and the higher cost of gas used for fuel. Taxes, transportation and other expense, which is generally based on product revenue, increased 76%, or $132 million,
primarily because of a corresponding increase in revenues. Taxes, transportation and



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other per Mcfe increased 34% from $0.47 in 2004 to $0.63 in 2005 primarily due to higher product prices. Exploration expense increased $13 million primarily
because of increased seismic expense and unsuccessful exploratory wells.

Depreciation, depletion and amortization (DD&A) increased
$248 million, or 61%, primarily because of increased production. On an Mcfe basis, DD&A increased 24% from $1.09 in 2004 to $1.35 in 2005 because of higher acquisition, development and infrastructure costs.

General and administrative expense decreased $10 million, or 6%. Excluding a $55 million decrease in incentive compensation related to performance share
grants to employees and the $12 million in special bonuses related to acquisitions announced in second quarter 2004, general and administrative expense increased $57 million, or 89%. Increased general and administrative expense is primarily because
of additional employees and higher employee expenses related to Company growth. Excluding stock-based incentive compensation, general and administrative expense per Mcfe increased 25% from $0.20 in 2004 to $0.25 in 2005.

The derivative fair value gain for 2005 was $13 million compared to the 2004 derivative fair value loss of $12 million. The 2005 gain is primarily
because of a $37 million gain related to natural gas basis swap agreements not qualifying for hedge accounting, partially offset by losses on Btu swap contracts. The derivative loss in 2004 was primarily attributable to the ineffective portion of
hedge derivatives, as well as the effect of higher gas prices on the fair value of Btu swap contracts. See Note 7 to Consolidated Financial Statements.

Interest expense increased $60 million, or 63%, primarily because of a 69% increase in the weighted average borrowings to partially fund property acquisitions. Interest expense per Mcfe increased 24% from $0.25 in
2004 to $0.31 in 2005. The 2005 effective income tax rate was 36.3%, as compared with a 38.5% effective rate for 2004. The higher rate in 2004 is because of higher state income taxes. Because of increased profit in 2005 and greater utilization of
net operating loss carryforwards in 2004, the current portion of total income tax expense increased from 20% in 2004 to 37% in 2005.

Liquidity and
Capital Resources

Our primary sources of liquidity are cash provided by operating activities, borrowings under either our revolving
credit agreement, our other unsecured and uncommitted lines of credit or our commercial paper program, occasional proved property sales and private or public offerings of equity and debt. Other than for operations, our cash requirements are
generally for the acquisition, exploration and development of oil and gas properties, and debt and dividend payments. Exploration and development expenditures and dividend payments have generally been funded by cash flow from operations. We believe
that our sources of liquidity are adequate to fund our cash requirements in 2007.

Cash provided by operating activities was $2.86 billion
in 2006, compared with cash provided by operating activities of $2.09 billion in 2005 and $1.22 billion in 2004. Increased cash provided by operating activities from 2005 to 2006 and from 2004 to 2005 was primarily because of higher price
realizations and increased production from acquisitions and development activity. Cash provided by operating activities was increased by changes in operating assets and liabilities of $5 million in 2006 and was decreased by changes in operating
assets and liabilities of $158 million in 2005 and $58 million in 2004. Changes in operating assets and liabilities are primarily the result of timing of cash receipts and disbursements. Cash provided by operating activities was also reduced by
exploration expense (net of dry hole expense beginning in 2006) of $13 million in 2006, $24 million in 2005 and $11 million in 2004. Cash provided by operating activities is largely dependent upon the prices received for oil and gas production. As
of February 2007, we have hedged approximately 65% of our 2007 projected gas production and about 80% of our projected 2007 crude oil production. See Significant Events, Transactions and ConditionsProduct Prices above.

Financial Condition

Total assets increased 31%
from $9.86 billion at December 31, 2005 to $12.89 billion at December 31, 2006, primarily because of Company growth related to acquisitions and development. As of December 31, 2006, total capitalization was $9.32 billion, of which 37%
was long-term debt. Capitalization at December 31, 2005 was $7.32 billion, of which 42.5% was long-term debt. The decrease in the debt-to-capitalization ratio from year-end 2005 to 2006 is primarily because of our 2006 earnings.



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Working Capital

We generally maintain low cash and cash equivalent balances because we use available funds to reduce either bank debt or borrowings under our commercial paper program. Short-term liquidity needs are satisfied by
either bank commitments under our loan agreements or our commercial paper program (see Financing below). Because of this, and since our principal source of operating cash flows (i.e., proved reserves to be produced in the following year)
cannot be reported as working capital, we often have low or negative working capital. Working capital improved from $59 million at December 31, 2005 to working capital of $345 million at December 31, 2006. Excluding the effects of
derivative fair value and deferred tax current assets and liabilities, working capital decreased $153 million from a negative position of $6 million at December 31, 2005 to a negative position of $159 million at December 31, 2006. This
decrease is because of increased accounts payable and accrued liabilities primarily related to increased production and drilling liabilities partially offset by increased current income taxes receivable. Any cash settlement of hedge derivatives
should generally be offset by increased or decreased cash flows from our sales of related production. Therefore, we believe that most of the changes in derivative fair value assets and liabilities are offset by changes in value of our oil and gas
reserves. This offsetting change in value of oil and gas reserves, however, is not recorded in the financial statements.

When the monthly
cash settlement amount under our hedge derivatives is calculated, if market prices are higher than the fixed contract prices, we are required to pay the contract counterparties. While this payment will ultimately be funded by higher prices received
from sale of our production, production receipts lag payments to the counterparties by as much as 55 days. Any interim cash needs are funded by borrowings under either our revolving credit agreement, our other unsecured and uncommitted lines of
credit, or our commercial paper program. None of our derivative contracts have margin requirements or collateral provisions that could require funding prior to the scheduled cash settlement date.

Most of our receivables are from a diverse group of companies including major energy companies, pipeline companies, local distribution companies and
end-users in various industries. We currently have greater concentrations of credit with several A- or better rated integrated energy companies. Financial and commodity-based futures and swap contracts expose us to the credit risk of nonperformance
by the counterparty to the contracts. This exposure is diversified among major investment grade financial institutions, and we have master netting agreements with counterparties that provide for offsetting payables against receivables from separate
derivative contracts. Letters of credit or other appropriate forms of security are obtained as considered necessary to limit risk of loss.

Financing

On December 31, 2006, we had no borrowings under our revolving credit agreement with commercial banks, and we had available
borrowing capacity of $1.34 billion net of commercial paper borrowings. In March 2006, we amended this agreement to, among other things, reduce the commitment fees and spread on our Eurodollar loans, eliminate the covenant restricting our ability to
make investments, expand our ability to incur liens and extend the maturity date one year. The facility matures April 1, 2011, with annual options to request successive one-year extensions. The interest rate on any borrowings is generally based
on the one-month LIBOR plus 0.40%. Interest is paid at maturity, or quarterly if the term is for a period of 90 days or more. We also incur a commitment fee on unused borrowing commitments, which is 0.09%. The agreement requires us to maintain a
ratio of debt-to-total capitalization of not more than 60%. We use the facility for general corporate purposes and as a backup facility for our new commercial paper program (see below).

In October 2006, we amended our revolving credit agreement to remove borrowing restrictions under any material adverse effect clauses. Credit
agreements commonly include such clauses which can remove the banks obligation to fund their commitment if any condition or event would reasonably be expected to have a material and adverse effect on the borrowers financial condition,
operations, properties or business considered as a whole, the borrowers ability to make timely debt payments, or the enforceability of material terms of the credit agreement. While our revolving credit agreement includes covenants that require
us to report a condition or event having a material adverse effect on the Company, the obligation of the banks to fund the revolving credit agreement is not conditioned on the absence of a material adverse effect.

In March 2006, we amended our $300 million term loan credit agreement to conform its covenants to our bank revolving credit agreement. However, we did
not amend the pricing or extend the maturity of the term loan. As of December 31, 2006, the interest rate on the term loan was 6.1%.



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In July 2006, our credit rating was upgraded by Standard & Poors to BBB and by
Moodys to Baa2. As a result of these upgrades, the interest rate on future borrowings was reduced by 0.15% under our revolving credit facility and by 0.125% under our term loan.

In November 2006, we initiated a commercial paper program. We may borrow up to $1.5 billion under this program. Borrowings under the commercial paper
program reduce our available capacity under the revolving credit facility on a dollar-for-dollar basis. The commercial paper borrowings may have terms up to 397 days and bear interest at rates agreed to at the time of the borrowing. The interest
rate is based on a standard index such as the Federal Funds Rate, LIBOR, or the money market rate as found on the commercial paper market. On December 31, 2006, borrowings were $159 million at an interest rate of 5.5%.

In March 2006, we sold $400 million of 5.65% senior notes due April 1, 2016 and $600 million of 6.1% senior notes due April 1, 2036. The 5.65%
senior notes were issued at 99.917% of par to yield 5.661% to maturity. The 6.1% senior notes were issued at 99.346% of par to yield 6.148% to maturity. Interest is payable on both series of notes each April 1 and October 1, beginning
October 1, 2006. Net proceeds of approximately $987 million were used to reduce borrowings outstanding under our bank revolving credit facility and for other general corporate purposes.

We entered into unsecured and uncommitted lines of credit with commercial banks in the amount of $200 million in October 2006, $100 million in January
2006 and $25 million in October 2006. As of December 31, 2006, there were no borrowings under these lines.

Capital Expenditures

In 2006, exploration and development cash expenditures totaled $2.06 billion compared with $1.33 billion in 2005. We have budgeted $2.4 billion for the
2007 development and exploration program and an additional $200 million for the construction of pipeline infrastructure and compression and processing facilities. As we have done historically, we expect to fund the 2007 development program with cash
flow from operations. We have the flexibility to adjust our actual development expenditures in response to changes in product prices, industry conditions and the effects of our acquisition and development programs.

Raw material shortages and strong global demand for steel have continued to tighten steel supplies and cause prices to remain high. In response, we have
maintained a higher tubular inventory and have negotiated supply contracts with our vendors to support our development program. While we expect to acquire adequate supplies to complete our development program, a further tightening of steel supplies
could restrain the program, limiting production growth and increasing development costs.

Although drilling rigs have recently been in
short supply throughout the industry, we have secured or contracted to secure the rigs necessary to support our current drilling program.

While an acquisition budget has not been formalized, we plan to actively review additional acquisition opportunities during 2007. If acquisition, development and exploration expenditures exceed cash flow from operations, we expect to obtain
additional funding through our bank credit facilities, our commercial paper program, issuance of public or private debt or equity, or asset sales. Other than the requirement for us to maintain a debt-to-total capitalization ratio of not more than
60%, there are no restrictions under our revolving credit agreement that would affect our ability to use our remaining borrowing capacity for acquisitions of producing properties.

To date, we have not spent significant amounts to comply with environmental or safety regulations, and we do not expect to do so during 2007. However,
new regulations, enforcement policies, claims for damages or other events could result in significant future costs.

Dividends

The Board of Directors declared quarterly dividends of $0.0075 per common share for first and second quarter 2004 and $0.0375 per common share for the
remainder of 2004, $0.05 per common share for the first three quarters of 2005 and $0.075 per common share for fourth quarter 2005 and the first three quarters of 2006. In November 2006, the Board of Directors increased the dividend rate 20% by
declaring a fourth quarter 2006 dividend of $0.09 per common share. On February 20, 2007, the Board of Directors increased the dividend rate 33% by declaring a first quarter 2007 dividend of $0.12 per common share.



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In January 2006, the Board of Directors declared a dividend to common stockholders, consisting of all
21.7 million Hugoton Royalty Trust units owned by us. The dividend ratio of 0.059609 trust units for each common share outstanding was set on the record date of April 26, 2006. The units were distributed on May 12, 2006, when this
dividend was recorded at approximately $1.687 per common share, based on the fair market value of the units on that date.

Our ability to
pay dividends is dependent upon our financial condition, earnings and cash flow from operations, the level of our capital expenditures, our future business prospects and other matters our Board deems relevant.

Income Taxes

As of December 31, 2006, all tax
loss carryforwards and alternative minimum tax credit carryforwards have been fully utilized.

Off-Balance Sheet Arrangements

We do not have any investments in unconsolidated entities or persons that could materially affect the liquidity or the availability of capital resources.
Under the terms of some of our operating leases for compressors, airplanes and vehicles, we have various residual value guarantees and other payment provisions upon our election to return the equipment under certain specified conditions. Guarantees
related to these leases were not material. The only material off-balance sheet arrangements that we have entered into are those disclosed in the following table of contractual obligations and commitments.

Contractual Obligations and Commitments

The
following summarizes our significant obligations and commitments to make future contractual payments as of December 31, 2006. We have not guaranteed the debt or obligations of any other party, nor do we have any other arrangements or
relationships with other entities that could potentially result in unconsolidated debt or losses.



|                                                                |  |       |       |                      |   |      |  |      |     |      |   |      |  |            |     |  |   |     |  |   |      
|--------------------------------------------------------------- |  | ----- | ----- | -------------------- | - | ---- |  | ---- | --- | ---- | - | ---- |  | ---------- | --- |  | - | --- |  | - | -----
|                                                                |  |       |       | Payments Due by Year
|(in millions)                                                   |  | Total |       | 2007                 |   | 2008 |  | 2009 |     | 2010 |   | 2011 |  | After 2011
|Long-term debt                                                  |  | $     | 3,451 |                      | $ |     |  | $    |    |      | $ |     |  | $          | 300 |  | $ | 159 |  | $ | 2,992
|Operating leases                                                |  |       | 112   |                      |   | 27   |  |      | 23  |      |   | 19   |  |            | 16  |  |   | 11  |  |   | 16   
|Drilling contracts                                              |  |       | 237   |                      |   | 171  |  |      | 49  |      |   | 17   |  |            |    |  |   |    |  |   |     
|Purchase commitments                                            |  |       | 83    |                      |   | 66   |  |      | 17  |      |   |     |  |            |    |  |   |    |  |   |     
|Transportation contracts                                        |  |       | 638   |                      |   | 61   |  |      | 69  |      |   | 74   |  |            | 73  |  |   | 66  |  |   | 295  
|Derivative contract liabilities at December 31, 2006 fair value |  |       | 38    |                      |   | 37   |  |      | 1   |      |   |     |  |            |    |  |   |    |  |   |     
|                                                                |  |       |       |                      |   |      |  |      |     |      |   |      |  |            |     |  |   |     |  |   |      
|Total                                                           |  | $     | 4,559 |                      | $ | 362  |  | $    | 159 |      | $ | 110  |  | $          | 389 |  | $ | 236 |  | $ | 3,303
|                                                                |  |       |       |                      |   |      |  |      |     |      |   |      |  |            |     |  |   |     |  |   |      

Long-Term Debt.At December 31, 2006, borrowings were $159 million under our commercial paper program.
Because we had both the intent and ability to refinance the balance due with borrowings under our senior bank revolving credit facility due in April 2011, the $159 million outstanding under the commercial paper program is reflected in the table
above as due in 2011. Borrowings of $300 million under our term bank facility are due in April 2010, and our senior notes, totaling $2.99 billion at December 31, 2006, are due in 2012 through 2036. For further information regarding long-term
debt, see Note 3 to Consolidated Financial Statements.

Transportation Contracts. We have entered firm transportation contracts with various
pipelines. Under these contracts we are obligated to transport minimum daily gas volumes, as calculated on a monthly basis, or pay for any deficiencies at a specified reservation fee rate. Our production committed to these pipelines is expected to
exceed the minimum daily volumes provided in the contracts. We have generally delivered at least minimum volumes under these firm transportation contracts, therefore avoiding payment for deficiencies.



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In October 2005, we entered into a ten-year firm transportation agreement that commences upon completion
of a new 168-mile pipeline spanning from East Texas to northeast Louisiana. Upon the pipelines completion, currently expected in second quarter 2007, we will transport daily gas volumes for a minimum monthly transportation fee of $3 million
plus fuel ranging from 0.8% to 1.6%, depending on receipt point and other conditions.

In December 2006, we entered into a ten-year firm
transportation contract that commences upon completion of a new 502-mile pipeline spanning from southeast Oklahoma to east Alabama. Upon the pipelines completion, currently expected in first quarter 2009, we will transport gas volumes for a
minimum transportation fee of $2 million per month plus fuel not to exceed 1.2%, depending on receipt point and other conditions.

The
potential effect of these agreements are not included in the above summary of our transportation contract commitments since our commitment is contingent upon completion of the pipelines.

Derivative Contracts.We have entered into futures contracts and swaps to hedge our exposure to oil and natural gas price fluctuations. As of December 31, 2006, the fixed prices specified by these
contracts generally exceeded market prices, resulting in a net derivative fair value current asset of $767 million and long-term asset of $55 million. If market prices are higher than the contract prices when the cash settlement amount is
calculated, we are required to pay the contract counterparties. As of December 31, 2006, the current liability related to such contracts was $37 million and the long-term liability related to such contracts was $1 million. While such payments
generally will be funded by higher prices received from the sale of our production, production receipts may be received as much as 55 days after payment to counterparties and can result in draws on either our revolving credit facility, our other
unsecured and uncommitted lines of credit or our commercial paper program. See Note 7 to Consolidated Financial Statements.

Post-Retirement Plans

We have a retiree medical plan that provides retired employees and directors with health care benefits similar to those provided
employees. Employees and directors are eligible to receive benefits when their combined age and years of qualified service total 60, with a minimum age of 45 and a minimum of five years of service. Otherwise, retirement benefits are only provided
through our defined contribution 401(k) plan. Post-retirement medical benefits are not prefunded but are paid when incurred. Our periodic benefit cost recorded for 2006 was $1 million and is expected to be approximately $2 million in 2007. Future
benefit costs will be affected by fluctuations in interest rates and health care cost trends. We do not currently anticipate that retiree medical plan costs will be significant in relation to the Companys future financial position, results of
operations or cash flows.

Related Party Transactions

A firm, affiliated with one of our nonemployee directors, has performed property acquisition advisory services for the Company. In February 2005, this firm was acquired by another company which continues to perform
property acquisition advisory services for us, and a division of the company also performed co-manager services on both our March 2006 and April 2005 senior note offerings (see Liquidity and Capital Resources Financing, above). We
paid this firm total fees of $78,500 in 2006, $5 million in 2005 and $9 million in 2004, and there were no amounts payable at December 31, 2006 or 2005.

A portion of the producing properties obtained in the ChevronTexaco acquisition were considered nonstrategic and marked for disposition at the time of purchase. In August 2004, we exchanged $38 million of these
properties for 19,000 net contiguous acres in our new core operating area, the Barnett Shale of North Texas, and $25 million in other consideration. This exchange was with companies either wholly or majority owned by the adult children and a brother
of Bob R. Simpson, Chairman and Chief Executive Officer of the Company. In connection with this exchange, we granted these companies an option to purchase other properties included in the ChevronTexaco acquisition. On March 1, 2005, these
companies purchased the properties for an adjusted purchase price of $11 million. Lehman Brothers Inc. provided a fairness opinion to the Board of Directors on the value of properties exchanged and sold.

In February 2007, in recognition of the Chairman and Chief Executive Officer of the Company and as part of a charitable giving program to support higher
education, the Board of Directors approved a conditional contribution of $6.8 million to assist in building an athletics and academic center at Baylor University. This contribution is to be paid in two equal installments of $3.4 million. The first
payment is expected to be paid in the first half of 2007 and the second is expected to be paid in the first half of 2008. Since this is a conditional contribution, the expense will not be included as general and administrative expense until such
time as the condition is satisfied which is also the time of the



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expected payments. Concurrently, our Chairman and Chief Executive Officer, made a $3.2 million pledge for the same project. In return for these
contributions, the Company and Mr. Simpson obtained naming rights for the building and certain facilities within the building.

Critical Accounting
Policies and Estimates

Our financial position and results of operations are significantly affected by accounting policies and estimates
related to our oil and gas properties, proved reserves, asset retirement obligation and commodity prices and risk management, as summarized below.

Oil
and Gas Property Accounting

Oil and gas exploration and production companies may elect to account for their property costs using either
the successful efforts or full cost accounting method. Under the successful efforts method, unsuccessful exploratory well costs, as well as all exploratory geological and geophysical costs, are expensed. Under the full cost
method, all exploration costs are capitalized, regardless of success. Selection of the oil and gas accounting method can have a significant impact on a companys financial results. We use the successful efforts method of accounting and
generally pursue acquisitions and development of proved reserves as opposed to exploration activities.

In accordance with Statement of
Financial Accounting Standards No. 144, we evaluate possible impairment of producing properties when conditions indicate that the properties may be impaired. Such conditions include a significant decline in product prices which we believe to be
other than temporary or a significant downward revision in estimated proved reserves for a field or area. An impairment provision must be recorded to adjust the net book value of the property to its estimated fair value if the net book value exceeds
the estimated future net cash flows from the property. The estimated fair value of the property is generally calculated as the discounted present value of future net cash flows. Our estimates of cash flows are based on the latest available proved
reserve and production information and managements estimates of future product prices and costs, based on available information such as forward strip prices and industry forecasts and analysis.

The impairment assessment process is primarily dependent upon the estimate of proved reserves. Any overstatement of estimated proved reserve quantities
would result in an overstatement of estimated future net cash flows, which could result in an understated assessment of impairment. The subjectivity and risks associated with estimating proved reserves are discussed under Oil and Gas
Reserves below. Prediction of product prices is subjective since prices are largely dependent upon supply and demand resulting from global and national conditions generally beyond our control. However, managements assessment of product
prices for purposes of impairment is consistent with that used in its business plans and investment decisions. While there is judgment involved in managements estimate of future product prices, the potential impact on impairment is not
currently significant since current and projected product prices are substantially higher than our net acquisition and development costs per Mcfe. Because of this, our historical impairment of producing properties has been limited to a $2 million
provision in 1998, and we do not currently expect significant future impairment unless product prices were to decline and remain at levels substantially below current levels. We believe that a sensitivity analysis regarding the effect of changes in
assumptions on estimated impairment is impracticable to provide because of the number of assumptions and variables involved which have interdependent effects on the potential outcome.

Oil and Gas Reserves

Our proved oil and gas reserves are estimated by independent petroleum
engineers. Reserve engineering is a subjective process that is dependent upon the quality of available data and the interpretation thereof, including evaluations and extrapolations of well flow rates and reservoir pressure. Estimates by different
engineers often vary, sometimes significantly. In addition, physical factors such as the results of drilling, testing and production subsequent to the date of an estimate, as well as economic factors such as changes in product prices, may justify
revision of such estimates. Because proved reserves are required to be estimated using prices at the date of the evaluation, estimated reserve quantities can be significantly impacted by changes in product prices.



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Proved reserves, as defined by the Financial Accounting Standards Board and adopted by the Securities and
Exchange Commission, are limited to reservoir areas that indicate economic producibility through actual production or conclusive formation tests, and generally cannot extend beyond the immediately adjoining undrilled portion. Although improved
technology often can identify possible or probable reserves other than by drilling, these reserves cannot be estimated and disclosed.

Depreciation, depletion and amortization of producing properties is computed on the unit-of-production method based on estimated proved oil and gas reserves. While total DD&A expense for the life of a property is limited to the
propertys total cost, proved reserve revisions result in a change in timing of when DD&A expense is recognized. Downward revisions of proved reserves result in an acceleration of DD&A expense, while upward revisions tend to lower the
rate of DD&A expense recognition. As shown in Note 15 to the Consolidated Financial Statements, net downward revisions of proved reserves on an Mcfe basis occurred in 2006 and 2004, resulting in an increase in DD&A expense of approximately
1%, or $8 million in 2006 and 2%, or $7 million in 2004. Net upward revisions occurred to proved reserves on an Mcfe basis in 2005, resulting in a decrease of DD&A expense of approximately 2%, or $10 million, in 2005. Based on proved reserves at
December 31, 2006, we estimate that a 1% change in proved reserves would increase or decrease 2007 DD&A expense by approximately $8 million.

During 2006, development and exploration activities resulted in extensions, additions, discoveries and net revisions of proved reserves that were 265% of our 2006 production. Over the last five years, our proved
reserve extensions, additions, discoveries and net revisions averaged 244% of our production for this period. Our proved reserve extensions, additions and discoveries in 2006 included an increase of 1.03 Tcfe in proved undeveloped reserves, or
approximately 66% of our total extensions, additions and discoveries, which are expected to be developed within three years. Over the past five years, approximately 73% of our proved reserves extensions, additions and discoveries were proved
undeveloped reserves which were generally reclassified to proved developed reserves within three years. Development of our proved undeveloped reserves is not subject to significant uncertainties such as regulatory approvals, and we believe that we
have adequate resources to develop these reserves, dependent on commodity prices not declining significantly. We believe that reserve additions, comparable to these historical reserve additions, are attainable in the near term future, subject to
product prices and development costs remaining at levels to ensure economic viability.

The standardized measure of discounted future net
cash flows and changes in such cash flows, as reported in Note 15 to Consolidated Financial Statements, are prepared using assumptions required by the Financial Accounting Standards Board and the Securities and Exchange Commission. Such assumptions
include using year-end oil and gas prices and year-end costs for estimated future development and production expenditures. Discounted future net cash flows are calculated using a 10% rate. Changes in any of these assumptions could have a significant
impact on the standardized measure. Accordingly, the standardized measure does not represent managements estimated current market value of proved reserves.

Asset Retirement Obligation

Our asset retirement obligation primarily represents the estimated present value of the amount
we will incur to plug, abandon and remediate our producing properties at the end of their productive lives, in accordance with applicable state laws. We determine our asset retirement obligation by calculating the present value of estimated cash
flows related to the liability. The retirement obligation is recorded as a liability at its estimated present value as of the assets inception, with an offsetting increase to producing properties. Periodic accretion of discount of the
estimated liability is recorded as an expense in the income statement.

Our liability is determined using significant assumptions,
including current estimates of plugging and abandonment costs, annual inflation of these costs, the productive lives of wells and our risk-adjusted interest rate. Changes in any of these assumptions can result in significant revisions to the
estimated asset retirement obligation. For example, as we analyze actual plugging and abandonment information, we may revise our estimates of current costs, the assumed annual inflation of these costs and/or the assumed productive lives of our
wells. During 2006, we revised our existing estimated asset retirement obligation by $36 million, or approximately 16% of the asset retirement obligation at December 31, 2005, based on a review of current plugging and abandonment costs. Over
the past three years, revisions to the estimated asset retirement obligation averaged approximately 11% of the asset retirement obligation at the beginning of the year. Revisions to the asset retirement obligation are recorded with an offsetting
change to producing properties, resulting in prospective changes to depreciation, depletion and amortization expense and accretion of discount. Because of the subjectivity of assumptions and the relatively long lives of most of our wells, the costs
to ultimately retire our wells may vary significantly from prior estimates.



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Commodity Prices and Risk Management

Commodity prices significantly affect our operating results, financial condition, cash flows and ability to borrow funds. Current market oil and gas prices are affected by supply and demand as well as seasonal,
political and other conditions which we generally cannot control. Oil and gas prices and markets are expected to continue their historical volatility. See Significant Events, Transactions and Conditions  Product Prices above.

We attempt to reduce our price risk on a portion of our production by entering into financial instruments such as futures contracts,
collars and basis swap agreements, as well as fixed price physical delivery contracts. While these instruments secure a certain price and, therefore, a certain cash flow, there is the risk that we may not be able to realize the full benefit of
rising prices. These contracts also expose us to credit risk of nonperformance by the contract counterparties, all of which are major investment grade financial institutions. We attempt to limit our credit risk by obtaining letters of credit or
other appropriate forms of security.

While our price risk management activities decrease the volatility of cash flows, they may obscure
our reported financial condition. As required under generally accepted accounting principles, we record derivative financial instruments at their fair value, representing projected gains and losses to be realized upon settlement of these contracts
in subsequent periods when related production occurs. These gains and losses are generally offset by increases and decreases in the market value of our proved reserves, which are not reflected in the financial statements. Derivatives that provide
effective cash flow hedges are designated as hedges, and, to the extent the hedge is determined to be effective, we defer related unrealized fair value gains and losses in accumulated other comprehensive income (loss) until the hedged transaction
occurs. See Derivatives under Note 1 to Consolidated Financial Statements regarding our accounting policy related to derivatives.

See also Commodity Price Risk under Item 7A, Quantitative and Qualitative Disclosures about Market Risk, for the effect of price changes on derivative fair value gains and losses.

Accounting Pronouncements

In September 2006,
Statement of Financial Accounting Standards (SFAS) No. 157, Fair Value Measurements, was issued. SFAS No. 157 provides guidance for using fair value to measure assets and liabilities. It applies whenever other standards require or
permit assets or liabilities to be measured at fair value but does not expand the use of fair value in any new circumstances. The provisions of SFAS No. 157 are effective for financial statements issued for fiscal years beginning after
November 15, 2007. The effect of adopting SFAS No. 157 has not been determined, but it is not expected to have a significant effect on our reported financial position or earnings.

Also in September 2006, SFAS No. 158, Employers Accounting for Defined Benefit Pension and Other Postretirement PlansAn Amendment of
FASB Statements No. 87, 88, 106, and 132R,was issued. SFAS No. 158 requires an employer to: (a) recognize in its statement of financial position an asset for a plans overfunded status or a liability for a plans
underfunded status; (b) measure a plans assets and its obligations that determine its funded status as of the end of the employers fiscal year (with limited exceptions); and (c) recognize changes in the funded status of a
defined benefit postretirement plan in comprehensive income in the year in which the changes occur. The requirement to recognize the funded status of a benefit plan and the disclosure requirements were adopted during fourth quarter 2006. The
requirement to measure plan assets and benefit obligations as of the date of the employers fiscal year-end statement of financial position is effective for fiscal years ending after December 15, 2008. Since we do not have a defined
benefit pension plan, this pronouncement relates only to our post-retirement health plan. The effect of adopting SFAS No. 158 was to increase other long-term liabilities by $2 million and to decrease accumulated other comprehensive income by
the same amount.

In February 2007. SFAS No. 159, The Fair Value Option for Financial Assets and Financial Liabilities -Including
an Amendment of FASB Statement No. 115, was issued. SFAS No. 159 permits an entity to choose to measure many financial instruments and certain other items at fair value. The fair value option established by SFAS No. 159 permits
all entities to choose to measure eligible items at fair value at specified election dates. Unrealized gains and losses on items for which the fair value option has been elected are to be recognized in earnings at each subsequent reporting date.
SFAS No. 159 is effective for financial statements issued for fiscal years beginning after November 15, 2007. The effect of adopting SFAS No. 159 has not been determined, but it is not expected to have a significant effect on reported
financial position or earnings.



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In July 2006, FASB Interpretation (FIN) No. 48, Accounting for Uncertainty in Income Taxes 
An Interpretation of FASB Statement No. 109, was issued. FIN No. 48 clarifies financial statement recognition and disclosure requirements for uncertain tax positions taken or expected to be taken in a tax return. Financial statement
recognition of the tax position is dependent on an assessment of a 50% or greater likelihood that the tax position will be sustained upon examination, based on the technical merits of the position. The provisions of FIN No. 48 must be adopted
as of the beginning of fiscal years beginning after December 15, 2006, with the cumulative effect reported as an adjustment to retained earnings at the adoption date. The effect of adoption of FIN No. 48 has not been determined, but is not
expected to have a significant effect on our reported financial position or earnings.

In September 2006, the SEC staff issued Staff
Accounting Bulletin Topic 1N, Financial Statements -Considering the Effects of Prior Year Misstatements when Quantifying Misstatements in Current Year Financial Statements (SAB 108). SAB 108 provides guidance on how prior year misstatements
should be evaluated when determining the materiality of misstatements in the current year financial statements. SAB 108 requires materiality to be determined by considering the effect of prior year misstatements on both the current year balance
sheet and income statement, with consideration of their carryover and reversing effects. SAB 108 also addresses how to correct material misstatements. The provisions of SAB 108 are effective for financial statements issued for fiscal years ending
after November 15, 2006. The effect of adopting SAB 108 did not have any effect on our reported financial position or earnings.

Production
Imbalances

We have gas production imbalance positions that are the result of partial interest owners selling more or less than their
proportionate share of gas on jointly owned wells. Imbalances are generally settled by disproportionate gas sales over the remaining life of the well, or by cash payment by the overproduced party to the underproduced party. We use the entitlement
method of accounting for natural gas sales. Accordingly, revenue is deferred for gas deliveries in excess of our net revenue interest, while revenue is accrued for the undelivered volumes. Production imbalances are generally recorded at the
estimated sales price in effect at the time of production. Our net gas imbalance payable of $2 million at December 31, 2006 was reported in the balance sheet as a $3 million net current receivable and a $5 million net long-term payable. At
December 31, 2005, our net gas imbalance payable of $7 million was reported in the balance sheet as a $6 million net current receivable and a $13 million net long-term payable.

Forward-Looking Statements

Certain information included in this annual report and other materials
filed or to be filed by us with the Securities and Exchange Commission, as well as information included in oral statements or other written statements made or to be made by us, contain projections and forward-looking statements within the meaning of
Section 21E of the Securities Exchange Act of 1934, as amended, and Section 27A of the Securities Act of 1933, as amended, relating to our operations and the oil and gas industry. Such forward-looking statements may be or may concern,
among other things, capital expenditures, capital budget, cash flow, drilling activity, drilling locations, the number of wells to be drilled, worked over or recompleted, acquisition and development activities and funding thereof, production and
reserve growth, pricing differentials, reserve potential, operating costs, operating margins, production activities, oil, gas and natural gas liquids reserves and prices, hedging activities and the results thereof, liquidity, debt repayment, unused
borrowing capacity, estimated stock award vesting periods, completion of pipelines and processing facilities, regulatory matters, competition and value of non-cash dividends. Such forward-looking statements are based on managements current
plans, expectations, assumptions, projections and estimates and are identified by words such as expects, intends, plans, projects, predicts, anticipates, believes,
estimates, goal, should, could, assume, and similar words that convey the uncertainty of future events. These statements are not guarantees of future performance and involve certain risks,
uncertainties and assumptions that are difficult to predict. Therefore, actual results may differ materially from expectations, estimates, or assumptions expressed in, forecasted in, or implied in such forward-looking statements. Some of the risk
factors that could cause actual results to differ materially are discussed in Item 1A, Risk Factors.



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|Item 7A. | QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET
RISK
|-------- | ----------------------------------------------------------

We only enter derivative
financial instruments in conjunction with our hedging activities. These instruments principally include commodity futures, collars, swaps and option agreements and interest rate swap agreements. These financial and commodity-based derivative
contracts are used to limit the risks of fluctuations in interest rates and natural gas and crude oil prices. Gains and losses on these derivatives are generally offset by losses and gains on the respective hedged exposures.

Our Board of Directors has adopted a policy governing the use of derivative instruments, which requires that all derivatives used by us relate to an
underlying, offsetting position, anticipated transaction or firm commitment, and prohibits the use of speculative, highly complex or leveraged derivatives. Risk management programs using derivatives must be authorized by the Chairman of the Board
and the Senior Executive Vice President and Chief of Staff. These programs are also reviewed quarterly by our internal risk management committee and annually by the Board of Directors.

Hypothetical changes in interest rates and prices chosen for the following estimated sensitivity effects are considered to be reasonably possible
near-term changes generally based on consideration of past fluctuations for each risk category. It is not possible to accurately predict future changes in interest rates and product prices. Accordingly, these hypothetical changes may not necessarily
be an indicator of probable future fluctuations.

Interest Rate Risk

We are exposed to interest rate risk on short-term and long-term debt carrying variable interest rates. At December 31, 2006, our variable rate debt had a carrying value of $459 million, which approximated its
fair value, and our fixed rate debt had a carrying value of $2.99 billion and an approximate fair value of $2.97 billion. We attempt to balance variable rate debt, fixed rate debt and debt maturities to manage interest cost, interest rate volatility
and financing risk. This is accomplished through a mix of bank debt with short-term variable rates and fixed rate senior and subordinated debt, as well as the occasional use of interest rate swaps.

The following table shows the carrying amount and fair value of long-term debt and the hypothetical change in fair value that would result from a
100-basis point change in interest rates. Unless otherwise noted, the hypothetical change in fair value could be a gain or a loss depending on whether interest rates increase or decrease.



|                                 |  |                |        |   |              |   |        |                                   |  |   |    
|-------------------------------- |  | -------------- | ------ | - | ------------ | - | ------ | --------------------------------- |  | - | ---
|(in millions)                    |  | CarryingAmount |        |   | FairValue(a) |   |        | Hypothetical Change in Fair
Value
|December 31, 2006 Long-term debt |  | $              | (3,451 | ) |              | $ | (3,427 | )                                 |  | $ | 220
|December 31, 2005 Long-term debt |  | $              | (3,109 | ) |              | $ | (3,154 | )                                 |  | $ | 131

---

|(a) | Fair value is based upon current market quotes and is the estimated amount required to purchase our long-term debt on the open market. This estimated value does not include
any redemption premium.
|--- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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Commodity Price Risk

We hedge a portion of our price risks associated with our natural gas and crude oil sales. Outstanding gas futures contracts, swap agreements and gas sell basis swap agreements had a net fair value gain of
approximately $624 million at December 31, 2006 and $144 million at December 31, 2005. Of the December 31, 2006 fair value, a $657 million gain has been determined based on the exchange-trade value of NYMEX contracts, and a $33
million loss has been determined based on the broker bid and ask quotes for basis contracts. These fair values approximate amounts confirmed by the counterparties. The aggregate effect of a hypothetical 10% change in gas prices would result in a
change of approximately $161 million in the fair value of these gas futures contracts, swap agreements and gas sell basis swap agreements at December 31, 2006. Outstanding gas purchase basis swap agreements had a net fair value gain of $8
million as of December 31, 2006. This fair value gain was determined based on the broker bid and ask quotes for basis contracts. The aggregate effect of a hypothetical 10% change in gas prices would result in a change of approximately $1
million in the fair value of gas purchase basis swap agreements at December 31, 2006. Outstanding oil futures contracts and differential swaps had a net fair value gain of $190 million as of December 31, 2006 and a net fair value loss of
$17 million at December 31, 2005. The aggregate effect of a hypothetical 10% change in oil prices would result in a change of approximately $134 million in the fair value of these oil futures and differential swaps at December 31, 2006.
None of our derivative contracts have margin requirements or collateral provisions that could require funding prior to the scheduled cash settlement date. See Note 8 to Consolidated Financial Statements.

Because most of our futures contracts and swap agreements have been designated as hedge derivatives, changes in their fair value generally are reported
as a component of accumulated other comprehensive income (loss) until the related sale of production occurs. At that time, the realized hedge derivative gain or loss is transferred to product revenues in the consolidated income statement.



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|Item 8. | FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA
|------- | -------------------------------------------

The following financial statements and supplementary information are included under Item 15(a):



|                                                                 |  |     
|---------------------------------------------------------------- |  | ----
|                                                                 |  | Page
|Consolidated Balance Sheets                                      |  | 49  
|Consolidated Income Statements                                   |  | 50  
|Consolidated Statements of Cash Flows                            |  | 51  
|Consolidated Statements of Stockholders Equity                  |  | 52  
|Notes to Consolidated Financial Statements                       |  | 53  
|Selected Quarterly Financial Data                                |  |     
|(Note 14 to Consolidated Financial Statements)                   |  | 83  
|Information about Oil and Gas Producing Activities               |  |     
|(Note 15 to Consolidated Financial Statements)                   |  | 84  
|Managements Report on Internal Control over Financial Reporting |  | 88  
|Reports of Independent Registered Public Accounting Firm         |  | 89  



|Item 9. | CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON
ACCOUNTING AND FINANCIAL DISCLOSURE
|------- | ------------------------------------------------------------------------------------

There have been no changes in accountants or any disagreements with accountants on any matter of accounting principles or practices or financial statement disclosures during the two years ended December 31, 2006.



|Item 9A. | CONTROLS AND PROCEDURES
|-------- | -----------------------

a) Evaluation of Disclosure Controls and Procedures

We performed an evaluation, under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, of the effectiveness of the design and operation of our disclosure controls
and procedures pursuant to Exchange Act Rules 13a-15 and 15d-15 as of the end of the period covered by this report. Based upon that evaluation, the Chief Executive Officer and the Chief Financial Officer concluded that our disclosure controls and
procedures are effective in timely alerting them to material information relating to the Company required to be included in our periodic filings with the Securities and Exchange Commission. Because of the inherent limitations in all control systems,
no evaluation of controls can provide absolute assurance that all control issues and instances of fraud, if any, within our Company have been detected.

b) Managements Report on Internal Control over Financial Reporting

Our managements report on
internal control over financial reporting is set forth in Item 8 of this Annual Report on Form 10-K and is incorporated by reference herein.

c) Changes in Internal Control over Financial Reporting

There were no changes in our internal controls over financial reporting
during the quarter ended December 31, 2006 that have materially affected, or are reasonably likely to materially affect, our internal controls over financial reporting.



|Item 9B. | OTHER INFORMATION
|-------- | -----------------

None.



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PART III

Except for the portion of Item 10 relating to Executive Officers of the Registrant which is
included in Part I of this Report or is included below, the information called for by Items 10 through 14 is incorporated by reference to the Companys Notice of Annual Meeting and Proxy Statement to be filed with the Securities and Exchange
Commission no later than April 30, 2007.



|Item 10. | DIRECTORS AND EXECUTIVE OFFICERS OF THE
REGISTRANT
|-------- | --------------------------------------------------

We have a Code of Business Conduct and Ethics that applies to all
directors, officers and employees, including the chief executive officer and senior financial officers. We also have a Code of Ethics for the Chief Executive Officer and Senior Financial Officers. You can find our Code of Business Conduct and Ethics
and our Code of Ethics for the Chief Executive Officer and Senior Financial Officers on our web site at http://www.xtoenergy.com. You can also obtain a free copy of these materials by contacting us at 810 Houston Street, Fort Worth, Texas 76102,
Attn: Corporate Secretary. Any amendments to or waivers from these codes that apply to our executive officers will be posted on the Companys web site or by other appropriate means in accordance with the rules of the Securities and Exchange
Commission.



|Item 11. | EXECUTIVE COMPENSATION
|-------- | ----------------------



|Item 12. | SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND
MANAGEMENT AND RELATED STOCKHOLDER MATTERS
|-------- | ----------------------------------------------------------------------------------------------



|Item 13. | CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS
|-------- | ----------------------------------------------



|Item 14. | PRINCIPAL ACCOUNTANT FEES AND SERVICES
|-------- | --------------------------------------



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PART IV



|Item 15. | EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
|-------- | ------------------------------------------

(a) The following documents are filed as a part of this report:



|   |  |                                                                                                                                                                                                             |  |     
|-- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ----
|   |  |                                                                                                                                                                                                             |  | Page
|1. |  | Financial Statements:                                                                                                                                                                                       |  |     
|   |  | Consolidated Balance Sheets at December 31, 2006 and 2005                                                                                                                                                   |  | 49  
|   |  | Consolidated Income Statements for the years ended December 31, 2006, 2005 and 2004                                                                                                                         |  | 50  
|   |  | Consolidated Statements of Cash Flows for the years ended December 31, 2006, 2005 and 2004                                                                                                                  |  | 51  
|   |  | Consolidated Statements of Stockholders Equity for the years ended December 31, 2006, 2005 and 2004                                                                                                        |  | 52  
|   |  | Notes to Consolidated Financial Statements                                                                                                                                                                  |  | 53  
|   |  | Managements Report on Internal Control over Financial Reporting                                                                                                                                            |  | 88  
|   |  | Reports of Independent Registered Public Accounting Firm                                                                                                                                                    |  | 89  
|   |  |                                                                                                                                                                                                            
|2. |  | Financial Statement Schedules:                                                                                                                                                                              |  |     
|   |  | All financial statement schedules have been omitted because they are not applicable or the required information is presented in the financial statements or the notes to consolidated financial
statements. |  |     

(b) Exhibits

See Index to Exhibits at page 92 for a description of the exhibits filed as a part of this report. Documents filed prior to June 1, 2001, were filed with the Securities and Exchange Commission under our prior
name, Cross Timbers Oil Company.



48



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XTO ENERGY INC.

Consolidated Balance Sheets



|                                                                                                           |  |             |        |   |      |   |        |  
|---------------------------------------------------------------------------------------------------------- |  | ----------- | ------ | - | ---- | - | ------ | -
|(in millions, except shares)                                                                               |  | December 31 |       
|                                                                                                           |  | 2006        |        |   | 2005 |  
|ASSETS                                                                                                     |  |             |        |   |      |   |        |  
|Current Assets:                                                                                            |  |             |        |   |      |   |        |  
|Cash and cash equivalents                                                                                  |  | $           | 5      |   |      | $ | 2      |  
|Accounts receivable, net                                                                                   |  |             | 656    |   |      |   | 644    |  
|Derivative fair value                                                                                      |  |             | 804    |   |      |   | 193    |  
|Current income tax receivable                                                                              |  |             | 66     |   |      |   | 35     |  
|Other                                                                                                      |  |             | 54     |   |      |   | 69     |  
|                                                                                                           |  |             |        |   |      |   |        |  
|Total Current Assets                                                                                       |  |             | 1,585  |   |      |   | 943    |  
|                                                                                                           |  |             |        |   |      |   |        |  
|                                                                                                           |  |            
|Property and Equipment, at cost  successful efforts method:                                               |  |             |        |   |      |   |        |  
|Proved properties                                                                                          |  |             | 12,369 |   |      |   | 9,979  |  
|Unproved properties                                                                                        |  |             | 414    |   |      |   | 283    |  
|Other                                                                                                      |  |             | 799    |   |      |   | 278    |  
|                                                                                                           |  |             |        |   |      |   |        |  
|Total Property and Equipment                                                                               |  |             | 13,582 |   |      |   | 10,540 |  
|Accumulated depreciation, depletion and amortization                                                       |  |             | (2,758 | ) |      |   | (2,032 | )
|                                                                                                           |  |             |        |   |      |   |        |  
|Net Property and Equipment                                                                                 |  |             | 10,824 |   |      |   | 8,508  |  
|                                                                                                           |  |             |        |   |      |   |        |  
|                                                                                                           |  |            
|Derivative fair value                                                                                      |  |             | 56     |   |      |   | 1      |  
|Acquired gas gathering contracts, net of amortization                                                      |  |             | 121    |   |      |   | 132    |  
|Goodwill                                                                                                   |  |             | 215    |   |      |   | 213    |  
|Other                                                                                                      |  |             | 84     |   |      |   | 60     |  
|                                                                                                           |  |             |        |   |      |   |        |  
|Total Other Assets                                                                                         |  |             | 476    |   |      |   | 406    |  
|                                                                                                           |  |             |        |   |      |   |        |  
|TOTAL ASSETS                                                                                               |  | $           | 12,885 |   |      | $ | 9,857  |  
|                                                                                                           |  |             |        |   |      |   |        |  
|                                                                                                           |  |            
|LIABILITIES AND STOCKHOLDERS EQUITY                                                                       |  |             |        |   |      |   |        |  
|Current Liabilities:                                                                                       |  |             |        |   |      |   |        |  
|Accounts payable and accrued liabilities                                                                   |  | $           | 912    |   |      | $ | 739    |  
|Payable to royalty trusts                                                                                  |  |             | 23     |   |      |   | 13     |  
|Derivative fair value                                                                                      |  |             | 37     |   |      |   | 90     |  
|Deferred income tax payable                                                                                |  |             | 263    |   |      |   | 38     |  
|Other                                                                                                      |  |             | 5      |   |      |   | 4      |  
|                                                                                                           |  |             |        |   |      |   |        |  
|Total Current Liabilities                                                                                  |  |             | 1,240  |   |      |   | 884    |  
|                                                                                                           |  |             |        |   |      |   |        |  
|                                                                                                           |  |            
|Long-term Debt                                                                                             |  |             | 3,451  |   |      |   | 3,109  |  
|                                                                                                           |  |             |        |   |      |   |        |  
|                                                                                                           |  |            
|Other Long-term Liabilities:                                                                               |  |             |        |   |      |   |        |  
|Derivative fair value                                                                                      |  |             | 1      |   |      |   |       |  
|Deferred income taxes payable                                                                              |  |             | 1,978  |   |      |   | 1,390  |  
|Asset retirement obligation                                                                                |  |             | 303    |   |      |   | 219    |  
|Other                                                                                                      |  |             | 47     |   |      |   | 46     |  
|                                                                                                           |  |             |        |   |      |   |        |  
|Total Other Long-term Liabilities                                                                          |  |             | 2,329  |   |      |   | 1,655  |  
|                                                                                                           |  |             |        |   |      |   |        |  
|                                                                                                           |  |            
|Commitments and Contingencies (Note 6)                                                                     |  |             |        |   |      |   |        |  
|                                                                                                           |  |            
|Stockholders Equity:                                                                                      |  |             |        |   |      |   |        |  
|Common stock ($0.01 par value, 1,000,000,000 shares authorized, 371,473,935 and 365,220,597 shares issued) |  |             | 4      |   |      |   | 4      |  
|Additional paid-in capital                                                                                 |  |             | 2,058  |   |      |   | 1,865  |  
|Treasury stock, at cost (3,919,872 and 1,655,413 shares)                                                   |  |             | (125   | ) |      |   | (39    | )
|Retained earnings                                                                                          |  |             | 3,442  |   |      |   | 2,311  |  
|Accumulated other comprehensive income                                                                     |  |             | 486    |   |      |   | 68     |  
|                                                                                                           |  |             |        |   |      |   |        |  
|Total Stockholders Equity                                                                                 |  |             | 5,865  |   |      |   | 4,209  |  
|                                                                                                           |  |             |        |   |      |   |        |  
|TOTAL LIABILITIES AND STOCKHOLDERS EQUITY                                                                 |  | $           | 12,885 |   |      | $ | 9,857  |  
|                                                                                                           |  |             |        |   |      |   |        |  

See accompanying notes to consolidated financial statements.



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XTO ENERGY INC.

Consolidated Income Statements



|                                                     |  |                        |       |   |      |   |       |      |  |   |       |  
|---------------------------------------------------- |  | ---------------------- | ----- | - | ---- | - | ----- | ---- |  | - | ----- | -
|(in millions, except per share data)                 |  | Year Ended December 31 |      
|                                                     |  | 2006                   |       |   | 2005 |   |       | 2004 | 
|REVENUES                                             |  |                        |       |   |      |   |       |      |  |   |       |  
|Gas and natural gas liquids                          |  | $                      | 3,490 |   |      | $ | 2,787 |      |  | $ | 1,613 |  
|Oil and condensate                                   |  |                        | 1,002 |   |      |   | 670   |      |  |   | 319   |  
|Gas gathering, processing and marketing              |  |                        | 86    |   |      |   | 56    |      |  |   | 18    |  
|Other                                                |  |                        | (2    | ) |      |   | 6     |      |  |   | (2    | )
|                                                     |  |                        |       |   |      |   |       |      |  |   |       |  
|Total Revenues                                       |  |                        | 4,576 |   |      |   | 3,519 |      |  |   | 1,948 |  
|                                                     |  |                        |       |   |      |   |       |      |  |   |       |  
|                                                     |  |                        |      
|EXPENSES                                             |  |                        |       |   |      |   |       |      |  |   |       |  
|Production                                           |  |                        | 491   |   |      |   | 406   |      |  |   | 246   |  
|Taxes, transportation and other                      |  |                        | 372   |   |      |   | 306   |      |  |   | 174   |  
|Exploration                                          |  |                        | 22    |   |      |   | 24    |      |  |   | 11    |  
|Depreciation, depletion and amortization             |  |                        | 875   |   |      |   | 655   |      |  |   | 407   |  
|Accretion of discount in asset retirement obligation |  |                        | 16    |   |      |   | 12    |      |  |   | 8     |  
|Gas gathering and processing                         |  |                        | 41    |   |      |   | 11    |      |  |   | 6     |  
|General and administrative                           |  |                        | 189   |   |      |   | 155   |      |  |   | 165   |  
|Derivative fair value (gain) loss                    |  |                        | (102  | ) |      |   | (13   | )    |  |   | 12    |  
|                                                     |  |                        |       |   |      |   |       |      |  |   |       |  
|Total Expenses                                       |  |                        | 1,904 |   |      |   | 1,556 |      |  |   | 1,029 |  
|                                                     |  |                        |       |   |      |   |       |      |  |   |       |  
|OPERATING INCOME                                     |  |                        | 2,672 |   |      |   | 1,963 |      |  |   | 919   |  
|                                                     |  |                        |       |   |      |   |       |      |  |   |       |  
|                                                     |  |                        |      
|OTHER (INCOME) EXPENSE                               |  |                        |       |   |      |   |       |      |  |   |       |  
|Gain on distribution of royalty trust units          |  |                        | (469  | ) |      |   |      |      |  |   |      |  
|Interest expense, net                                |  |                        | 180   |   |      |   | 153   |      |  |   | 93    |  
|                                                     |  |                        |       |   |      |   |       |      |  |   |       |  
|Total Other (Income) Expense                         |  |                        | (289  | ) |      |   | 153   |      |  |   | 93    |  
|                                                     |  |                        |       |   |      |   |       |      |  |   |       |  
|INCOME BEFORE INCOME TAX                             |  |                        | 2,961 |   |      |   | 1,810 |      |  |   | 826   |  
|INCOME TAX EXPENSE                                   |  |                        | 1,101 |   |      |   | 658   |      |  |   | 318   |  
|                                                     |  |                        |       |   |      |   |       |      |  |   |       |  
|NET INCOME                                           |  | $                      | 1,860 |   |      | $ | 1,152 |      |  | $ | 508   |  
|                                                     |  |                        |       |   |      |   |       |      |  |   |       |  
|EARNINGS PER COMMON SHARE                            |  |                        |       |   |      |   |       |      |  |   |       |  
|Basic                                                |  | $                      | 5.10  |   |      | $ | 3.21  |      |  | $ | 1.53  |  
|                                                     |  |                        |       |   |      |   |       |      |  |   |       |  
|Diluted                                              |  | $                      | 5.03  |   |      | $ | 3.15  |      |  | $ | 1.51  |  
|                                                     |  |                        |       |   |      |   |       |      |  |   |       |  
|WEIGHTED AVERAGE COMMON SHARES OUTSTANDING           |  |                        | 364.8 |   |      |   | 358.4 |      |  |   | 332.9 |  
|                                                     |  |                        |       |   |      |   |       |      |  |   |       |  

See accompanying notes to consolidated financial statements.



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XTO ENERGY INC.

Consolidated Statements of Cash Flows



|                                                                                                |  |                        |        |   |      |   |        |      |  |   |        |  
|----------------------------------------------------------------------------------------------- |  | ---------------------- | ------ | - | ---- | - | ------ | ---- |  | - | ------ | -
|(in millions)                                                                                   |  | Year Ended December 31 |       
|                                                                                                |  | 2006                   |        |   | 2005 |   |        | 2004 | 
|OPERATING ACTIVITIES                                                                            |  |                        |        |   |      |   |        |      |  |   |        |  
|Net income                                                                                      |  | $                      | 1,860  |   |      | $ | 1,152  |      |  | $ | 508    |  
|Adjustments to reconcile net income to net cash provided by operating activities:               |  |                        |        |   |      |   |        |      |  |   |        |  
|Depreciation, depletion and amortization                                                        |  |                        | 875    |   |      |   | 655    |      |  |   | 407    |  
|Accretion of discount in asset retirement obligation                                            |  |                        | 16     |   |      |   | 12     |      |  |   | 8      |  
|Non-cash incentive compensation                                                                 |  |                        | 63     |   |      |   | 34     |      |  |   | 67     |  
|Dry hole expense                                                                                |  |                        | 9      |   |      |   |       |      |  |   |       |  
|Deferred income tax                                                                             |  |                        | 529    |   |      |   | 415    |      |  |   | 255    |  
|Gain on distribution of royalty trust units                                                     |  |                        | (469   | ) |      |   |       |      |  |   |       |  
|Non-cash derivative fair value (gain) loss                                                      |  |                        | (39    | ) |      |   | (39    | )    |  |   | 6      |  
|Other non-cash items                                                                            |  |                        | 10     |   |      |   | 23     |      |  |   | 24     |  
|Changes in operating assets and liabilities, net of effects of acquisitions of corporations (a) |  |                        | 5      |   |      |   | (158   | )    |  |   | (58    | )
|                                                                                                |  |                        |        |   |      |   |        |      |  |   |        |  
|Cash Provided by Operating Activities                                                           |  |                        | 2,859  |   |      |   | 2,094  |      |  |   | 1,217  |  
|                                                                                                |  |                        |        |   |      |   |        |      |  |   |        |  
|                                                                                                |  |                        |       
|INVESTING ACTIVITIES                                                                            |  |                        |        |   |      |   |        |      |  |   |        |  
|Proceeds from sale of property and equipment                                                    |  |                        | 6      |   |      |   | 17     |      |  |   | 25     |  
|Property acquisitions, including acquisitions of corporations                                   |  |                        | (616   | ) |      |   | (1,407 | )    |  |   | (1,905 | )
|Development costs, capitalized exploration costs and dry hole expense                           |  |                        | (2,047 | ) |      |   | (1,304 | )    |  |   | (523   | )
|Other property and asset additions                                                              |  |                        | (379   | ) |      |   | (214   | )    |  |   | (115   | )
|                                                                                                |  |                        |        |   |      |   |        |      |  |   |        |  
|Cash Used by Investing Activities                                                               |  |                        | (3,036 | ) |      |   | (2,908 | )    |  |   | (2,518 | )
|                                                                                                |  |                        |        |   |      |   |        |      |  |   |        |  
|                                                                                                |  |                        |       
|FINANCING ACTIVITIES                                                                            |  |                        |        |   |      |   |        |      |  |   |        |  
|Proceeds from long-term debt                                                                    |  |                        | 5,719  |   |      |   | 3,825  |      |  |   | 3,884  |  
|Payments on long-term debt                                                                      |  |                        | (5,377 | ) |      |   | (2,977 | )    |  |   | (3,093 | )
|Net proceeds from common stock offering                                                         |  |                        |       |   |      |   |       |      |  |   | 580    |  
|Dividends                                                                                       |  |                        | (109   | ) |      |   | (67    | )    |  |   | (20    | )
|Senior note and debt offering costs                                                             |  |                        | (9     | ) |      |   | (5     | )    |  |   | (14    | )
|Proceeds from exercise of stock options and warrants                                            |  |                        | 24     |   |      |   | 73     |      |  |   | 8      |  
|Payments upon exercise of stock options                                                         |  |                        | (46    | ) |      |   | (20    | )    |  |   | (13    | )
|Excess tax benefit on exercise of stock options                                                 |  |                        | 50     |   |      |   |       |      |  |   |       |  
|Purchases of treasury stock and other                                                           |  |                        | (72    | ) |      |   | (23    | )    |  |   | (28    | )
|                                                                                                |  |                        |        |   |      |   |        |      |  |   |        |  
|Cash Provided by Financing Activities                                                           |  |                        | 180    |   |      |   | 806    |      |  |   | 1,304  |  
|                                                                                                |  |                        |        |   |      |   |        |      |  |   |        |  
|                                                                                                |  |                        |       
|INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS                                                |  |                        | 3      |   |      |   | (8     | )    |  |   | 3      |  
|Cash and Cash Equivalents, January 1                                                            |  |                        | 2      |   |      |   | 10     |      |  |   | 7      |  
|                                                                                                |  |                        |        |   |      |   |        |      |  |   |        |  
|Cash and Cash Equivalents, December 31                                                          |  | $                      | 5      |   |      | $ | 2      |      |  | $ | 10     |  
|                                                                                                |  |                        |        |   |      |   |        |      |  |   |        |  
|(a)Changes in Operating Assets and Liabilities                                                  |  |                        |        |   |      |   |        |      |  |   |        |  
|Accounts receivable                                                                             |  | $                      | (12    | ) |      | $ | (258   | )    |  | $ | (132   | )
|Other current assets                                                                            |  |                        | (16    | ) |      |   | (47    | )    |  |   | (40    | )
|Other operating assets and liabilities                                                          |  |                        | (12    | ) |      |   | (3     | )    |  |   | 4      |  
|Current liabilities                                                                             |  |                        | 45     |   |      |   | 150    |      |  |   | 110    |  
|                                                                                                |  |                        |        |   |      |   |        |      |  |   |        |  
|                                                                                                |  | $                      | 5      |   |      | $ | (158   | )    |  | $ | (58    | )
|                                                                                                |  |                        |        |   |      |   |        |      |  |   |        |  

See accompanying notes to consolidated financial statements.



51



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XTO ENERGY INC.

Consolidated Statements of Stockholders Equity

(in millions, except per share amounts)



|                                                                                                                                                   |  |             |   |                          |   |               |  |   |                  |   |  |                                            |       |   |       |   |      |   |  |   |       |  
|-------------------------------------------------------------------------------------------------------------------------------------------------- |  | ----------- | - | ------------------------ | - | ------------- |  | - | ---------------- | - |  | ------------------------------------------ | ----- | - | ----- | - | ---- | - |  | - | ----- | -
|                                                                                                                                                   |  | CommonStock |   | AdditionalPaid-inCapital |   | TreasuryStock |  |   | RetainedEarnings |   |  | AccumulatedOtherComprehensiveIncome (Loss) |       |   | Total |  
|Balances, December 31, 2003                                                                                                                        |  | $           | 3 |                          | $ | 753           |  | $ |                 |   |  | $                                          | 763   |   |       | $ | (53  | ) |  | $ | 1,466 |  
|                                                                                                                                                   |  |             |   |                          |   |               |  |   |                  |   |  |                                            |       |   |       |   |      |   |  |   |       |  
|Net income                                                                                                                                         |  |             |  |                          |   |              |  |   |                 |   |  |                                            | 508   |   |       |   |     |   |  |   | 508   |  
|Change in hedge derivative fair value, net of applicable income tax of $51                                                                         |  |             |  |                          |   |              |  |   |                 |   |  |                                            |      |   |       |   | (85  | ) |  |   | (85   | )
|Hedge derivative contract settlements reclassified into earnings from accumulated other comprehensive income, net of applicable income tax of
$64  |  |             |  |                          |   |              |  |   |                 |   |  |                                            |      |   |       |   | 109  |   |  |   | 109   |  
|                                                                                                                                                   |  |             |   |                          |   |               |  |   |                  |   |  |                                            |       |   |       |   |      |   |  |   |       |  
|Comprehensive income                                                                                                                               |  |             |   |                          |   |               |  |   |                  |   |  |                                            |       |   |       |   |      |   |  |   | 532   |  
|                                                                                                                                                   |  |             |   |                          |   |               |  |   |                  |   |  |                                            |       |   |       |   |      |   |  |   |       |  
|Issuance/vesting of performance shares                                                                                                             |  |             |  |                          |   | 64            |  |   | (24              | ) |  |                                            |      |   |       |   |     |   |  |   | 40    |  
|Stock option exercises, including income tax benefits                                                                                              |  |             |  |                          |   | 13            |  |   |                 |   |  |                                            |      |   |       |   |     |   |  |   | 13    |  
|Treasury stock purchases                                                                                                                           |  |             |  |                          |   |              |  |   | (1               | ) |  |                                            |      |   |       |   |     |   |  |   | (1    | )
|Common stock offering                                                                                                                              |  |             |  |                          |   | 580           |  |   |                 |   |  |                                            |      |   |       |   |     |   |  |   | 580   |  
|Common stock dividends ($0.09 per share)                                                                                                           |  |             |  |                          |   |              |  |   |                  |   |  |                                            | (31   | ) |       |   |     |   |  |   | (31   | )
|                                                                                                                                                   |  |             |   |                          |   |               |  |   |                  |   |  |                                            |       |   |       |   |      |   |  |   |       |  
|                                                                                                                                                   |  |             |   |                          |   |              
|Balances, December 31, 2004                                                                                                                        |  |             | 3 |                          |   | 1,410         |  |   | (25              | ) |  |                                            | 1,240 |   |       |   | (29  | ) |  |   | 2,599 |  
|                                                                                                                                                   |  |             |   |                          |   |               |  |   |                  |   |  |                                            |       |   |       |   |      |   |  |   |       |  
|Net income                                                                                                                                         |  |             |  |                          |   |              |  |   |                 |   |  |                                            | 1,152 |   |       |   |     |   |  |   | 1,152 |  
|Change in hedge derivative fair value, net of applicable income tax of $27                                                                         |  |             |  |                          |   |              |  |   |                 |   |  |                                            |      |   |       |   | (48  | ) |  |   | (48   | )
|Hedge derivative contract settlements reclassified into earnings from accumulated other comprehensive income, net of applicable income tax of
$81  |  |             |  |                          |   |              |  |   |                 |   |  |                                            |      |   |       |   | 145  |   |  |   | 145   |  
|                                                                                                                                                   |  |             |   |                          |   |               |  |   |                  |   |  |                                            |       |   |       |   |      |   |  |   |       |  
|Comprehensive income                                                                                                                               |  |             |   |                          |   |               |  |   |                  |   |  |                                            |       |   |       |   |      |   |  |   | 1,249 |  
|                                                                                                                                                   |  |             |   |                          |   |               |  |   |                  |   |  |                                            |       |   |       |   |      |   |  |   |       |  
|Issuance/vesting of performance shares                                                                                                             |  |             |  |                          |   | 33            |  |   | (14              | ) |  |                                            |      |   |       |   |     |   |  |   | 19    |  
|Stock option exercises, including income tax benefits                                                                                              |  |             |  |                          |   | 75            |  |   |                 |   |  |                                            |      |   |       |   |     |   |  |   | 75    |  
|Issuance of common stock and warrants for acquisition of corporation                                                                               |  |             | 1 |                          |   | 347           |  |   |                 |   |  |                                            |      |   |       |   |     |   |  |   | 348   |  
|Common stock dividends ($0.225 per share)                                                                                                          |  |             |  |                          |   |              |  |   |                 |   |  |                                            | (81   | ) |       |   |     |   |  |   | (81   | )
|                                                                                                                                                   |  |             |   |                          |   |               |  |   |                  |   |  |                                            |       |   |       |   |      |   |  |   |       |  
|                                                                                                                                                   |  |             |   |                          |   |              
|Balances, December 31, 2005                                                                                                                        |  |             | 4 |                          |   | 1,865         |  |   | (39              | ) |  |                                            | 2,311 |   |       |   | 68   |   |  |   | 4,209 |  
|                                                                                                                                                   |  |             |   |                          |   |               |  |   |                  |   |  |                                            |       |   |       |   |      |   |  |   |       |  
|Net income                                                                                                                                         |  |             |  |                          |   |              |  |   |                 |   |  |                                            | 1,860 |   |       |   |     |   |  |   | 1,860 |  
|Change in hedge derivative fair value, net of applicable income tax of $473                                                                        |  |             |  |                          |   |              |  |   |                 |   |  |                                            |      |   |       |   | 810  |   |  |   | 810   |  
|Hedge derivative contract settlements reclassified into earnings from accumulated other comprehensive income, net of applicable income tax of
$225 |  |             |  |                          |   |              |  |   |                 |   |  |                                            |      |   |       |   | (390 | ) |  |   | (390  | )
|Adjustment related to initial recognition of funded status of post-retirement health plan, net of applicable
income tax of $1                      |  |             |  |                          |   |              |  |   |                 |   |  |                                            |      |   |       |   | (2   | ) |  |   | (2    | )
|                                                                                                                                                   |  |             |   |                          |   |               |  |   |                  |   |  |                                            |       |   |       |   |      |   |  |   |       |  
|Comprehensive income                                                                                                                               |  |             |   |                          |   |               |  |   |                  |   |  |                                            |       |   |       |   |      |   |  |   | 2,278 |  
|                                                                                                                                                   |  |             |   |                          |   |               |  |   |                  |   |  |                                            |       |   |       |   |      |   |  |   |       |  
|Issuance/vesting of stock awards                                                                                                                   |  |             |  |                          |   | 10            |  |   | (3               | ) |  |                                            |      |   |       |   |     |   |  |   | 7     |  
|Expensing of stock options                                                                                                                         |  |             |  |                          |   | 53            |  |   |                 |   |  |                                            |      |   |       |   |     |   |  |   | 53    |  
|Stock option and warrant exercises, including income tax benefits                                                                                  |  |             |  |                          |   | 28            |  |   |                 |   |  |                                            |      |   |       |   |     |   |  |   | 28    |  
|Treasury stock purchases                                                                                                                           |  |             |  |                          |   |              |  |   | (83              | ) |  |                                            |      |   |       |   |     |   |  |   | (83   | )
|Issuance of common stock for acquisition of corporation                                                                                            |  |             |  |                          |   | 102           |  |   |                 |   |  |                                            |      |   |       |   |     |   |  |   | 102   |  
|Fair value of royalty trust unit distribution ($1.687 per share)                                                                                   |  |             |  |                          |   |              |  |   |                 |   |  |                                            | (614  | ) |       |   |     |   |  |   | (614  | )
|Common stock dividends ($0.315 per share)                                                                                                          |  |             |  |                          |   |              |  |   |                 |   |  |                                            | (115  | ) |       |   |     |   |  |   | (115  | )
|                                                                                                                                                   |  |             |   |                          |   |               |  |   |                  |   |  |                                            |       |   |       |   |      |   |  |   |       |  
|                                                                                                                                                   |  |             |   |                          |   |              
|Balances, December 31, 2006                                                                                                                        |  | $           | 4 |                          | $ | 2,058         |  | $ | (125             | ) |  | $                                          | 3,442 |   |       | $ | 486  |   |  | $ | 5,865 |  
|                                                                                                                                                   |  |             |   |                          |   |               |  |   |                  |   |  |                                            |       |   |       |   |      |   |  |   |       |  

See accompanying notes to consolidated financial statements.



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XTO ENERGY INC.

Notes to Consolidated Financial Statements

1. Organization and Summary of Significant Accounting Policies

XTO Energy Inc., a Delaware corporation, was organized under the name Cross Timbers Oil Company in October 1990 to ultimately acquire the business and
properties of predecessor entities that were created from 1986 through 1989. Cross Timbers Oil Company completed its initial public offering of common stock in May 1993 and changed its name to XTO Energy Inc. in June 2001.

The accompanying consolidated financial statements include the financial statements of XTO Energy Inc. and all of its wholly owned subsidiaries. All
significant intercompany balances and transactions have been eliminated in consolidation. In preparing the accompanying financial statements, management has made certain estimates and assumptions that affect reported amounts in the financial
statements and disclosures of contingencies. Actual results may differ from those estimates. Certain amounts presented in prior period financial statements have been reclassified for consistency with current period presentation.

All common stock shares and per share amounts in the accompanying financial statements have been adjusted for the four-for-three stock split effected on
March 15, 2005 and the five-for-four stock split effected March 17, 2004.

We are an independent oil and gas company with
production and exploration concentrated in the southwestern and central United States. We also gather, process and market gas, transport and market oil and conduct other activities directly related to our oil and gas producing activities.

Property and Equipment

We follow the successful efforts method of accounting, capitalizing costs of successful exploratory wells and expensing costs of unsuccessful exploratory wells. Exploratory geological and geophysical costs are expensed as incurred. All
developmental costs are capitalized. We generally pursue acquisition and development of proved reserves as opposed to exploration activities. A significant portion of the property costs reflected in the accompanying consolidated balance sheets are
from acquisitions of proved properties from other oil and gas companies. Proved properties balances include costs of $713 million at December 31, 2006 and $472 million at December 31, 2005 related to wells in process of drilling. Drill
well costs are transferred to proved properties generally within one month of the well completion date. As of December 31, 2006, capitalized costs totaled approximately $8 million for three exploratory wells completed more than one year ago and
pending completion of pipelines to the well site. These exploratory wells are expected to be transferred to proved properties during the first quarter of 2007. Inventory held for future use on our producing properties totaled $37 million at
December 31, 2006 and $53 million at December 31, 2005, and is included in other current assets on the consolidated balance sheet.

Depreciation, depletion and amortization of proved producing properties is computed on the unit-of-production method based on estimated proved oil and gas reserves. Other property and equipment is generally depreciated using either the
unit-of-production method for assets associated with specific reserves or the straight-line method over estimated useful lives which range from 3 to 40 years. Repairs and maintenance are expensed, while renewals and betterments are generally
capitalized.

If conditions indicate that long-term assets may be impaired, the carrying value of property is compared to managements
future estimated pre-tax cash flow from properties generally aggregated on a field-level basis. If impairment is necessary, the asset carrying value is written down to fair value. Cash flow pricing estimates are based on existing proved reserve and
production information and pricing assumptions that management believes are reasonable. Impairment of individually significant unproved properties is assessed on a property-by-property basis, and impairment of other unproved properties is assessed
and amortized on an aggregate basis.



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In December 2004, the Financial Accounting Standards Board issued SFAS No. 153, Exchanges of
Nonmonetary Assets, an Amendment of APB Opinion No. 29, which provides that all nonmonetary asset exchanges that have commercial substance must be measured based on the fair value of the assets exchanged, and any resulting gain or loss
recorded. An exchange is defined as having commercial substance if it results in a significant change in expected future cash flows. Exchanges of operating interests by oil and gas producing companies to form a joint venture continue to be exempted.
APB Opinion No. 29 previously exempted exchanges of similar productive assets from fair value accounting, subject to recording an impairment loss. We adopted the provisions of SFAS No. 153 beginning July 1, 2005, and, based on the
fair value of properties exchanged, we recognized a $10 million gain on the exchange of nonmonetary assets during 2005 (Note 13).

Asset
Retirement Obligation

Effective January 1, 2003, we adopted Statement of Financial Accounting Standards No. 143,
Accounting for Asset Retirement Obligations. SFAS No. 143 provides that, if the fair value for asset retirement obligation can be reasonably estimated, the liability should be recognized in the period when it is incurred. Oil and gas
producing companies incur this liability upon acquiring or drilling a well. Under the method prescribed by SFAS No. 143, the retirement obligation is recorded as a liability at its estimated present value at the assets inception, with an
offsetting increase to proved properties on the balance sheet. Periodic accretion of discount of the estimated liability is recorded as an expense in the income statement. See Note 5.

Royalty Trusts

We created Cross
Timbers Royalty Trust in February 1991 and Hugoton Royalty Trust in December 1998 by conveying defined net profits interests in certain of our properties. Units of both trusts are traded on the New York Stock Exchange. We make monthly net profits
payments to each trust based on revenues and costs from the related underlying properties. We owned 54.3% of Hugoton Royalty Trust, which is the portion we retained following our sale of units in 1999 and 2000. In January 2006, the Board of
Directors declared a dividend to common stockholders, consisting of all 21.7 million Hugoton Royalty Trust units owned by us. The dividend ratio of 0.059609 trust units for each common share outstanding was set on the record date of
April 26, 2006. The units were distributed on May 12, 2006, when this dividend was recorded. We recorded this dividend at $614 million, or approximately $1.687 per common share, the fair market value of the units based on the May 12,
2006 average high and low New York Stock Exchange trade price of $28.31. After considering the cost of the trust units, we recorded a gain on distribution of $469 million before income tax.

We announced in January 2006 that the Company would consider selling its interests in the underlying properties that are subject to the Cross Timbers
Royalty Trust and Hugoton Royalty Trust net profits interests. However, in August 2006, after a full review, we announced that we will retain ownership of these underlying properties at this time.

Amounts due the trusts, net of amounts retained by our ownership of trust units, are deducted from our revenues, taxes, production expenses and
development costs.

Cash and Cash Equivalents

Cash equivalents are considered to be all highly liquid investments having an original maturity of three months or less.

Income Taxes

We record deferred income tax assets and liabilities to recognize timing differences
between recognition of income for financial statement and income tax reporting purposes. Deferred income tax assets are calculated using enacted tax rates applicable to taxable income in the years when we anticipate these timing differences will
reverse. The effect of changes in tax rates is recognized in the period of enactment. See Note 4.



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Other Assets

Other assets primarily include deferred debt costs that are amortized to interest expense over the term of the related debt (Note 3) and the long-term portion of gas balancing receivable (see Revenue Recognition
and Gas Balancingbelow). Other assets are presented net of accumulated amortization of $16 million at December 31, 2006 and $19 million at December 31, 2005.

In accordance with Statement of Financial Accounting Standards No. 142,Goodwill and Other Intangible Assets, we have determined that a
portion of the purchase price of the Antero Resources Corporation acquisition (Note 13) is allocable to gas gathering contracts and goodwill. Gas gathering contracts are associated with the pipeline acquired, and the value of $140 million has been
determined based on the estimated discounted cash flows from those contracts. The gas gathering contracts are amortized, as a component of depreciation, depletion and amortization expense, on a unit-of-production basis using the estimated proved
reserves of the related Barnett Shale properties. Accumulated amortization of acquired gas gathering contracts was $19 million as of December 31, 2006 and $8 million as of December 31, 2005. Amortization expense is expected to be
approximately $6 million to $9 million annually from 2007 through 2011, depending on Barnett Shale production.

Goodwill of $215 million
represents the excess of the purchase price paid for Antero Resources over the fair value of the assets acquired and liabilities assumed. In accordance with SFAS No. 142, goodwill is not amortized, but instead is subject to an annual assessment
of impairment based on a fair value test performed in the fourth quarter.

Derivatives

We use derivatives to hedge against changes in cash flows related to product price and interest rate risks, as opposed to their use for trading purposes.
SFAS No. 133, Accounting for Derivative Instruments and Hedging Activities, requires that all derivatives be recorded on the balance sheet at fair value. We generally determine the fair value of futures contracts and swap contracts based
on the difference between the derivatives fixed contract price and the underlying market price at the determination date. The fair value of call options and collars are generally determined under the Black-Scholes option-pricing model. Most
values are confirmed by counterparties to the derivative.

Realized and unrealized gains and losses on derivatives that are not designated
as hedges, as well as on the ineffective portion of hedge derivatives, are recorded as a derivative fair value gain or loss in the income statement. Unrealized gains and losses on effective cash flow hedge derivatives, as well as any deferred gain
or loss realized upon early termination of effective hedge derivatives, are recorded as a component of accumulated other comprehensive income. When the hedged transaction occurs, the realized gain or loss, as well as any deferred gain or loss, on
the hedge derivative is transferred from accumulated other comprehensive income to earnings. Realized gains and losses on commodity hedge derivatives are recognized in oil and gas revenues, and realized gains and losses on interest hedge derivatives
are recorded as adjustments to interest expense. Settlements of derivatives are included in cash flows from operating activities.



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To summarize, we record our derivatives at fair value in our consolidated balance sheets. Gains and
losses resulting from changes in fair value and upon settlement are reported as follows:



|                                                                  |          |                          |                                                                                                                                             |                                                                                                              
|----------------------------------------------------------------- | -------- | ------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------
|Derivative Type                                                   |          | Fair Value Gains/ Losses |                                                                                                                                             | Financial Statement Reporting                                                                                
|Non-hedge
derivatives and Hedge derivatives
 ineffective portion |          | Unrealized and Realized  |                                                                                                                                             | Reported in the Consolidated Income Statements as derivative fair
value (gain) loss                          
|                                                                  |          |                         
|Hedge
derivatives  effective portion                             |          | Unrealized               |                                                                                                                                             | Reported in Stockholders
Equity in the Consolidated Balance Sheets as accumulated other comprehensive income
|                                                                  | Realized |                          | Reported in the Consolidated Income Statements and classified
based on the hedged item (e.g., gas revenue, oil revenue or interest expense)

To designate a derivative as a cash flow hedge, we document at the hedges inception our
assessment that the derivative will be highly effective in offsetting expected changes in cash flows from the item hedged. This assessment, which is updated at least quarterly, is generally based on the most recent relevant historical correlation
between the derivative and the item hedged. The ineffective portion of the hedge is calculated as the difference between the change in fair value of the derivative and the estimated change in cash flows from the item hedged. If, during the
derivatives term, we determine the hedge is no longer highly effective, hedge accounting is prospectively discontinued and any remaining unrealized gains or losses, based on the effective portion of the derivative at that date, are
reclassified to earnings as oil or gas revenue or interest expense when the underlying transaction occurs. If it is determined that the designated hedge transaction is not probable to occur, any unrealized gains or losses are recognized immediately
in the income statement as a derivative fair value gain or loss. During 2006, 2005 and 2004, there were no gains or losses reclassified into earnings as a result of the discontinuance of hedge accounting treatment for any of our derivatives.

Physical delivery contracts that are not expected to be net cash settled are deemed to be normal sales. However, physical delivery
contracts that have a price not clearly and closely associated with the asset sold are not a normal sale and must be accounted for as a non-hedge derivative.

Revenue Recognition and Gas Balancing

Oil, gas and natural gas liquids revenues are recognized when
the products are sold to a purchaser at a fixed or determinable price, delivery has occurred and title has transferred, and collectibility of the revenue is reasonably assured. At times we may sell more or less than our entitled share of gas
production. When this happens, we use the entitlement method of accounting for gas sales, based on our net revenue interest in production. Accordingly, revenue is deferred for gas deliveries in excess of our net revenue interest, while revenue is
accrued for the undelivered volumes. Production imbalances are generally recorded at the estimated sales price in effect at the time of production. Our net gas imbalance payable of $2 million at December 31, 2006 was reported in the balance
sheet as a $3 million net current receivable and a $5 million net long-term payable. At December 31, 2005, our net gas imbalance payable of $7 million was reported in the balance sheet as a $6 million net current receivable and a $13 million
net long-term payable.

Gas Gathering, Processing and Marketing Revenues

We market our gas, as well as some gas produced by third parties, to brokers, local distribution companies and end-users. Gas gathering and marketing
revenues are recognized in the month of delivery based on customer nominations. Gas processing and marketing revenues are recorded net of cost of gas sold of $287 million for 2006, $185 million for 2005 and $99 million for 2004. These amounts are
net of intercompany eliminations.



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Other Revenues

Other revenues result from and are related to our ongoing major operations. These revenues include various gains and losses, including from lawsuits and other disputes, as well as from non-significant sales of
property and equipment.

Loss Contingencies

We account for loss contingencies in accordance with SFAS No. 5,Accounting for Contingencies. Accordingly, when management determines that it is probable that an asset has been impaired or a liability has
been incurred, we accrue our best estimate of the loss if it can be reasonably estimated. Our legal costs related to litigation are expensed as incurred. See Note 6.

Interest

Interest expense includes amortization of deferred debt costs and is presented net of
interest income of $3 million in 2006, $1 million in 2005 and less than $1 million in 2004, and net of capitalized interest of $18 million in 2006, $6 million in 2005 and $3 million in 2004. Interest is capitalized as producing property cost based
on the weighted average interest rate and the cost of wells in process of drilling. Included in accounts payable and accrued liabilities is accrued interest of $54 million at December 31, 2006 and $32 million at December 31, 2005.

Stock-Based Compensation

Effective January 1, 2006, we adopted SFAS No. 123 (Revised 2004), Share-Based Payment, which requires that compensation related to all stock-based awards, including stock options, be recognized in the financial statements
based on their estimated grant-date fair value. We have previously recorded stock compensation pursuant to the intrinsic value method under APB Opinion No. 25, whereby compensation was recorded related to performance share and unrestricted
share awards and no compensation was recognized for most stock option awards. We are using the modified prospective application method of adopting SFAS No. 123R, whereby the estimated fair value of unvested stock awards granted prior to
January 1, 2006 will be recognized as compensation expense in periods subsequent to December 31, 2005, based on the same valuation method used in our prior pro forma disclosures. We have estimated expected forfeitures, as required by SFAS
No. 123R, and we are recognizing compensation expense only for those awards expected to vest. Compensation expense is amortized over the estimated service period, which is the shorter of the awards time vesting period or the derived
service period as implied by any accelerated vesting provisions when the common stock price reaches specified levels. All compensation must be recognized by the time the award vests. The cumulative effect of initially adopting SFAS No. 123R was
immaterial. See Note 12.



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The following are pro forma net income and earnings per share for the years ended December 31, 2005
and 2004, as if stock-based compensation had been recorded at the estimated fair value of stock awards at the grant date, as prescribed by SFAS No. 123, Accounting for Stock-Based Compensation:



|                                                                                                                               |  |                       |       |   |      |   |      |  
|------------------------------------------------------------------------------------------------------------------------------ |  | --------------------- | ----- | - | ---- | - | ---- | -
|(in millions, except per share data)                                                                                           |  | Year EndedDecember 31 |      
|                                                                                                                               |  | 2005                  |       |   | 2004 |  
|Net income as reported                                                                                                         |  | $                     | 1,152 |   |      | $ | 508  |  
|Add stock-based compensation expense included in the income statement, net of related tax effects                              |  |                       | 22    |   |      |   | 56   |  
|Deduct stock-based employee compensation expense determined under fair value method for all awards, net of related tax effects |  |                       | (73   | ) |      |   | (77  | )
|                                                                                                                               |  |                       |       |   |      |   |      |  
|Pro forma net income                                                                                                           |  | $                     | 1,101 |   |      | $ | 487  |  
|                                                                                                                               |  |                       |       |   |      |   |      |  
|Earnings per common share:                                                                                                     |  |                       |       |   |      |   |      |  
|Basicas reported                                                                                                              |  | $                     | 3.21  |   |      | $ | 1.53 |  
|                                                                                                                               |  |                       |       |   |      |   |      |  
|Basicpro forma                                                                                                                |  | $                     | 3.07  |   |      | $ | 1.46 |  
|                                                                                                                               |  |                       |       |   |      |   |      |  
|Dilutedas reported                                                                                                            |  | $                     | 3.15  |   |      | $ | 1.51 |  
|                                                                                                                               |  |                       |       |   |      |   |      |  
|Dilutedpro forma                                                                                                              |  | $                     | 3.01  |   |      | $ | 1.45 |  
|                                                                                                                               |  |                       |       |   |      |   |      |  

Earnings per Common Share

In accordance with SFAS No. 128, Earnings Per Share, we report basic earnings per common share, which excludes the effect of potentially
dilutive securities, and diluted earnings per common share, which includes the effect of all potentially dilutive securities unless their impact is antidilutive. See Note 10.

Segment Reporting

In accordance with
SFAS No. 131, Disclosures about Segments of an Enterprise and Related Information, we evaluated how the Company is organized and managed and have identified only one operating segment, which is the exploration and production of oil,
natural gas and natural gas liquids. We consider our gathering, processing and marketing functions as ancillary to our oil and gas producing activities. All of our assets are located in the United States, and all revenues are attributable to United
States customers.

Our production is sold to various purchasers, based on their credit rating and location of our production. For the year
ended December 31, 2006, sales to each of two purchasers were approximately 22% and 15% total revenues. For the year ended December 31, 2005, sales to each of three purchasers were approximately 23%, 14% and 14% of total revenues. For the
year ended December 31, 2004, sales to each of two purchasers were approximately 20% and 13% of total revenues. We believe that alternative purchasers are available, if necessary, to purchase production at prices substantially similar to those
received from these significant purchasers. We currently have greater concentrations of credit with several A- or better rated integrated energy companies.

New Accounting Pronouncements

In September 2006, Statement of Financial Accounting Standards (SFAS)
No. 157, Fair Value Measurements, was issued. SFAS No. 157 provides guidance for using fair value to measure assets and liabilities. It applies whenever other standards require or permit assets or liabilities to be measured at fair
value, but it does not expand the use of fair value in any new circumstances. The provisions of SFAS No. 157 are effective for financial statements issued for fiscal years beginning after November 15, 2007. The effect of adopting SFAS
No. 157 has not been determined, but it is not expected to have a significant effect on our reported financial position or earnings.

Also in September 2006, SFAS No. 158, Employers Accounting for Defined Benefit Pension and Other Postretirement PlansAn Amendment of FASB Statements No. 87, 88, 106, and 132R,was issued. SFAS No. 158
requires an employer to: (a) recognize in its statement of financial position an asset for a plans overfunded status or a



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liability for a plans underfunded status; (b) measure a plans assets and its obligations that determine its funded status as of the end of
the employers fiscal year (with limited exceptions); and (c) recognize changes in the funded status of a defined benefit postretirement plan in comprehensive income in the year in which the changes occur. The requirement to recognize the
funded status of a benefit plan and the disclosure requirements were adopted during fourth quarter 2006 (Note 12). The requirement to measure plan assets and benefit obligations as of the date of the employers fiscal year-end statement of
financial position is effective for fiscal years ending after December 15, 2008. Since we do not have a defined benefit pension plan, this pronouncement relates only to our post-retirement health plan. The effect of adopting SFAS No. 158
was to increase other long-term liabilities by $2 million and to decrease accumulated other comprehensive income by the same amount.

In
February 2007. SFAS No. 159, The Fair Value Option for Financial Assets and Financial Liabilities -Including an Amendment of FASB Statement No. 115,was issued. SFAS No. 159 permits an entity to choose to measure many financial
instruments and certain other items at fair value. The fair value option established by SFAS No. 159 permits all entities to choose to measure eligible items at fair value at specified election dates. Unrealized gains and losses on items for
which the fair value option has been elected are to be recognized in earnings at each subsequent reporting date. SFAS No. 159 is effective for financial statements issued for fiscal years beginning after November 15, 2007. The effect of
adopting SFAS No. 159 has not been determined, but it is not expected to have a significant effect on reported financial position or earnings.

In July 2006, FASB Interpretation (FIN) No. 48, Accounting for Uncertainty in Income TaxesAn Interpretation of FASB Statement No. 109, was issued. FIN No. 48 clarifies financial statement recognition and
disclosure requirements for uncertain tax positions taken or expected to be taken in a tax return. Financial statement recognition of the tax position is dependent on an assessment of a 50% or greater likelihood that the tax position will be
sustained upon examination, based on the technical merits of the position. The provisions of FIN No. 48 must be adopted as of the beginning of fiscal years beginning after December 15, 2006, with the cumulative effect reported as an
adjustment to retained earnings at the adoption date. The effect of adoption of FIN No. 48 has not been determined, but is not expected to have a significant effect on our reported financial position or earnings.

In September 2006, the SEC staff issued Staff Accounting Bulletin Topic 1N, Financial Statements -Considering the Effects of Prior Year Misstatements
when Quantifying Misstatements in Current Year Financial Statements(SAB 108). SAB 108 provides guidance on how prior year misstatements should be evaluated when determining the materiality of misstatements in the current year financial
statements. SAB 108 requires materiality to be determined by considering the effect of prior year misstatements on both the current year balance sheet and income statement, with consideration of their carryover and reversing effects. SAB 108 also
addresses how to correct material misstatements. The provisions of SAB 108 are effective for financial statements issued for fiscal years ending after November 15, 2006. The effect of adopting SAB 108 did not have any effect on our reported
financial position or earnings.

2. Related Party Transactions

A firm, affiliated with one of our nonemployee directors, has performed property acquisition advisory services for the Company. In February 2005, this firm was acquired by another company which continues to perform
property acquisition advisory services for us, and a division of the company also performed co-manager services on our March 2006 and April 2005 senior note offerings (see Note 3). We paid this firm total fees of $78,500 in 2006, $5 million in 2005
and $9 million in 2004, and there were no amounts payable at December 31, 2006 or 2005.

A portion of the producing properties
obtained in the ChevronTexaco acquisition (Note 13) were considered nonstrategic and marked for disposition at the time of purchase. In August 2004, we exchanged $38 million of these properties for 19,000 net contiguous acres in our new core
operating area, the Barnett Shale of North Texas, and $25 million in other consideration. This exchange was with companies either wholly or majority owned by the adult children and a brother of Bob R. Simpson, Chairman and Chief Executive Officer of
the Company. In connection with this exchange, we granted these companies an option to purchase other properties included in the ChevronTexaco acquisition. In March 2005, these companies purchased the properties for an adjusted purchase price of $11
million. Lehman Brothers Inc. provided a fairness opinion to the Board of Directors on the value of properties exchanged and sold.



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In February 2007, in recognition of the Chairman and Chief Executive Officer of the Company and as part
of a charitable giving program to support higher education, the Board of Directors approved a conditional contribution of $6.8 million to assist in building an athletics and academic center at Baylor University. This contribution is to be paid in
two equal installments of $3.4 million. The first payment is expected to be paid in the first half of 2007 and the second is expected to be paid in the first half of 2008. Since this is a conditional contribution, the expense will not be included as
general and administrative expense until such time as the condition is satisfied which is also the time of the expected payments. Concurrently, our Chairman and Chief Executive Officer, made a $3.2 million pledge for the same project. In return for
these contributions, the Company and Mr. Simpson obtained naming rights for the building and certain facilities within the building.

3. Debt

Our long-term debt consists of the following:



|                                                    |  |             |       |      |   |      
|--------------------------------------------------- |  | ----------- | ----- | ---- | - | -----
|(in millions)                                       |  | December 31
|                                                    |  | 2006        |       | 2005
|Bank debt:                                          |  |             |       |      |   |      
|Commercial paper, 5.5% at December 31, 2006         |  | $           | 159   |      | $ |     
|Revolving credit agreement due April 2011           |  |             |      |      |   | 813  
|Term loan due April 2010, 6.1% at December 31, 2006 |  |             | 300   |      |   | 300  
|                                                    |  |            
|Senior notes:                                       |  |             |       |      |   |      
|71/2%, due April 15, 2012                           |  |             | 350   |      |   | 350  
|61/4%, due April 15, 2013                           |  |             | 400   |      |   | 400  
|4.9%, due February 1, 2014, net of discount         |  |             | 497   |      |   | 497  
|5%, due January 31, 2015, net of discount           |  |             | 350   |      |   | 350  
|5.3% due June 30, 2015, net of discount             |  |             | 399   |      |   | 399  
|5.65%, due April 1, 2016, net of discount           |  |             | 400   |      |   |     
|6.1%, due April 1, 2036, net of discount            |  |             | 596   |      |   |     
|                                                    |  |             |       |      |   |      
|Total long-term debt                                |  | $           | 3,451 |      | $ | 3,109
|                                                    |  |             |       |      |   |      

Other than borrowings under our commercial paper program, revolving credit agreement and term
loan, no debt matures within five years. Because we had both the intent and ability to refinance the commercial paper balance outstanding with borrowings under our revolving credit facility due in April 2011, we have classified these borrowings as
long-term debt in our consolidated balance sheets. Before the stated maturities of April 2010 or April 2011, we may renegotiate the commercial paper program, revolving credit agreement and term loan to increase the borrowing commitment and extend
the maturity.

Commercial Paper

In November 2006, we initiated a commercial paper program. We may borrow up to $1.5 billion under this program. Borrowings under the commercial paper program reduce our available capacity under the revolving credit facility on a
dollar-for-dollar basis. The commercial paper borrowings may have terms up to 397 days and bear interest at rates agreed to at the time of the borrowing. The interest rate is based on a standard index such as the Federal Funds Rate, LIBOR, or the
money market rate as found on the commercial paper market. On December 31, 2006, borrowings were $159 million at an interest rate of 5.5%. The weighted average interest rate on commercial paper borrowings was 5.4% during 2006.

Bank Debt

On December 31, 2006,
we had no borrowings under our revolving credit agreement with commercial banks, and we had available borrowing capacity of $1.34 billion net of our commercial paper borrowings. In March 2006, we amended this agreement to, among other things, reduce
the commitment fees and spread on our Eurodollar loans, eliminate the covenant restricting our ability to make investments, expand our ability to incur liens and extend the maturity date one year. The facility matures April 1, 2011, with annual
options to request successive one-year extensions.



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The interest rate on any borrowings is generally based on the one-month LIBOR plus 0.40%. Interest is paid at maturity,
or quarterly if the term is for a period of 90 days or more. We also incur a commitment fee on unused borrowing commitments, which is 0.09%. The agreement requires us to maintain a ratio of debt-to-total capitalization of not more than 60%. We use
the facility for general corporate purposes and as a backup facility for our new commercial paper program (see above). The weighted average interest rate on bank debt was 5.4% during 2006, 4.3% during 2005 and 2.6% during 2004.

In October 2006, we amended our revolving credit agreement to remove borrowing restrictions under any material adverse effect clauses. Credit
agreements commonly include such clauses which can remove the banks obligation to fund their commitment if any condition or event would reasonably be expected to have a material and adverse effect on the borrowers financial condition,
operations, properties or business considered as a whole, the borrowers ability to make timely debt payments, or the enforceability of material terms of the credit agreement. While our revolving credit agreement includes covenants that require
us to report a condition or event having a material adverse effect on the Company, the obligation of the banks to fund the revolving credit agreement is not conditioned on the absence of a material adverse effect.

In March 2006, we amended our $300 million term loan credit agreement to conform its covenants to our bank revolving credit agreement. However, we did
not amend the pricing or extend the maturity of the term loan.

In July 2006, our credit rating was upgraded by Standard &
Poors to BBB and by Moodys to Baa2. As a result of these upgrades, the interest rate on future borrowings was reduced by 0.15% under our revolving credit facility and by 0.125% under our term loan.

We entered into unsecured and uncommitted lines of credit with commercial banks in the amount of $200 million in October 2006, $100 million in January
2006 and $25 million in October 2006. As of December 31, 2006, there were no borrowings under these lines.

Senior Notes

In January 2004, we sold $500 million of 4.9% senior notes that were issued at 99.34% of par to yield 4.98% to maturity. The notes
mature in February 2014 and interest is payable each February 1 and August 1. Net proceeds of $490 million were used to fund our January 2004 property acquisitions of $243 million (Note 13) and to reduce bank debt.

In September 2004, we sold $350 million of 5% senior notes that were issued at 99.918% of par to yield 5.011% to maturity. The notes are due in January
2015 and interest is payable each January 31 and July 31. Net proceeds of $347 million were used to reduce bank debt associated with our 2004 acquisitions.

In April 2005, we sold $400 million of 5.3% senior notes at 99.683% of par to yield 5.338% to maturity. The notes mature in June 2015 and interest is payable each June 30 and December 30. Net proceeds of
approximately $395 million were used to reduce borrowings under our bank revolving credit facility.

In March 2006, we sold $400 million of
5.65% senior notes due April 1, 2016 and $600 million of 6.1% senior notes due April 1, 2036. The 5.65% senior notes were issued at 99.917% of par to yield 5.661% to maturity. The 6.1% senior notes were issued at 99.346% of par to yield
6.148% to maturity. Interest is payable on both series of notes each April 1 and October 1, beginning October 1, 2006. Net proceeds of approximately $987 million were used to reduce borrowings outstanding under our bank revolving
credit facility and for other general corporate purposes.

The senior notes require no sinking fund. We may redeem all or a part of the
senior notes at any time at a price of 100% of their principal balance plus accrued interest and a make-whole premium payment. The make-whole premium is calculated as any excess over the principal balance of the present value of remaining principal
and interest payments at the U.S. Treasury rate for a comparable maturity plus no more than 0.25%.



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4. Income Tax

The following reconciles our income tax expense to the amount calculated at the statutory federal income tax rate:



|                                                       |  |      |       |      |   |      |  |   |    
|------------------------------------------------------ |  | ---- | ----- | ---- | - | ---- |  | - | ---
|(in millions)                                          |  | 2006 |       | 2005 |   | 2004
|Income tax expense at the federal statutory rate (35%) |  | $    | 1,036 |      | $ | 634  |  | $ | 289
|State and local income taxes and other (a)             |  |      | 65    |      |   | 24   |  |   | 29 
|                                                       |  |      |       |      |   |      |  |   |    
|Income tax expense                                     |  | $    | 1,101 |      | $ | 658  |  | $ | 318
|                                                       |  |      |       |      |   |      |  |   |    

---

|(a) | The 2006 provision includes $34 million related to enactment of a new State of Texas margin tax.
|--- | ------------------------------------------------------------------------------------------------

Components of income tax expense are as follows:



|                                      |  |      |       |      |   |      |  |   |    
|------------------------------------- |  | ---- | ----- | ---- | - | ---- |  | - | ---
|(in millions)                         |  | 2006 |       | 2005 |   | 2004
|Current income tax (a)                |  | $    | 572   |      | $ | 243  |  | $ | 63 
|Deferred income tax                   |  |      | 505   |      |   | 398  |  |   | 167
|Net operating loss carryforwards used |  |      | 24    |      |   | 17   |  |   | 88 
|                                      |  |      |       |      |   |      |  |   |    
|Income tax expense                    |  | $    | 1,101 |      | $ | 658  |  | $ | 318
|                                      |  |      |       |      |   |      |  |   |    

---

|(a) | The current income tax provision exceeds cash tax expense by the benefit realized upon exercise of stock options not expensed in the financial statements. This benefit, which
is recorded in additional paid-in capital, was $50 million in 2006, $21 million in 2005 and $18 million in 2004.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Deferred
tax assets and liabilities are the result of temporary differences between the financial statement carrying values and tax bases of assets and liabilities. Our net deferred tax assets and liabilities are recorded as a current liability of $263
million and a long-term liability of $1.98 billion at December 31, 2006 and as a current liability of $38 million and a long-term liability of $1.39 billion at December 31, 2005. Significant components of net deferred tax assets and
liabilities are:



|                                 |  |             |        |   |      |   |        |  
|-------------------------------- |  | ----------- | ------ | - | ---- | - | ------ | -
|(in millions)                    |  | December 31 |       
|                                 |  | 2006        |        |   | 2005 |  
|Deferred tax assets:             |  |             |        |   |      |   |        |  
|Net operating loss carryforwards |  | $           |       |   |      | $ | 24     |  
|Derivative fair value loss       |  |             | 22     |   |      |   | 35     |  
|Other                            |  |             | 43     |   |      |   | 18     |  
|                                 |  |             |        |   |      |   |        |  
|Total deferred tax assets        |  |             | 65     |   |      |   | 77     |  
|                                 |  |             |        |   |      |   |        |  
|                                 |  |            
|Deferred tax liabilities:        |  |             |        |   |      |   |        |  
|Property and equipment           |  |             | (1,971 | ) |      |   | (1,426 | )
|Derivative fair value gain       |  |             | (319   | ) |      |   | (70    | )
|Other                            |  |             | (16    | ) |      |   | (9     | )
|                                 |  |             |        |   |      |   |        |  
|Total deferred tax liabilities   |  |             | (2,306 | ) |      |   | (1,505 | )
|                                 |  |             |        |   |      |   |        |  
|Net deferred tax liabilities     |  | $           | (2,241 | ) |      | $ | (1,428 | )
|                                 |  |             |        |   |      |   |        |  

As of December 31, 2006, all tax loss carryforwards and alternative minimum tax credit
carryforwards have been fully utilized.



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5. Asset Retirement Obligation

Our asset retirement obligation primarily represents the estimated present value of the amount we will incur to plug, abandon and remediate our proved producing properties at the end of their productive lives, in
accordance with applicable state laws. We determine our asset retirement obligation by calculating the present value of estimated cash flows related to the liability. The following is a summary of asset retirement obligation activity for the years
ended December 31, 2006 and 2005:



|                                                     |  |      |     |   |      |   |     |  
|---------------------------------------------------- |  | ---- | --- | - | ---- | - | --- | -
|(in millions)                                        |  | 2006 |     |   | 2005 |  
|Asset retirement obligation, January 1               |  | $    | 223 |   |      | $ | 160 |  
|Revisions in the estimated cash flows                |  |      | 36  |   |      |   | 16  |  
|Liability incurred upon acquiring and drilling wells |  |      | 35  |   |      |   | 37  |  
|Liability settled upon plugging and abandoning wells |  |      | (3  | ) |      |   | (2  | )
|Accretion of discount expense                        |  |      | 16  |   |      |   | 12  |  
|                                                     |  |      |     |   |      |   |     |  
|Asset retirement obligation, December 31             |  |      | 307 |   |      |   | 223 |  
|Less current portion                                 |  |      | (4  | ) |      |   | (4  | )
|                                                     |  |      |     |   |      |   |     |  
|Asset retirement obligation, long term               |  | $    | 303 |   |      | $ | 219 |  
|                                                     |  |      |     |   |      |   |     |  

6. Commitments and Contingencies

Leases

We lease compressors, offices,
vehicles, aircraft and certain other equipment in our primary locations under noncancelable operating leases. Commitments related to these lease payments are not recorded in the accompanying consolidated balance sheets. As of December 31, 2006,
minimum future lease payments for all noncancelable lease agreements (including the sale and operating leaseback agreements described below) were as follows:



|              |  |   |    
|------------- |  | - | ---
|(in millions) |  |  
|2007          |  | $ | 27 
|2008          |  |   | 23 
|2009          |  |   | 19 
|2010          |  |   | 16 
|2011          |  |   | 11 
|Remaining     |  |   | 16 
|              |  |   |    
|Total         |  | $ | 112
|              |  |   |    

Amounts incurred under operating leases (including renewable monthly leases) were $55 million in
2006, $41 million in 2005 and $35 million in 2004.

In March 1996, we sold our Tyrone gas processing plant and related gathering system and
entered an agreement to lease the facility from the buyers for an initial term of eight years with fixed renewal options for an additional 13 years. This transaction was recorded as a sale and operating leaseback, with no gain or loss on the sale.
In September 2006, we extended the lease until March 2008.

In November 1996, we sold a gathering system in Major County, Oklahoma and
entered an agreement to lease the facility from the buyers for an initial term of eight years, with fixed renewal options for an additional ten years. This transaction was recorded as a sale and operating leaseback, with a deferred gain on the sale.
The deferred gain was fully recognized at December 31, 2006. In May 2006, we extended the lease until November 2007.



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Under each of the above sale and leaseback transactions, we do not have the right or option to purchase,
nor does the lessor have the obligation to sell, the facility at any time. However, if the lessor decides to sell the facility at the end of the initial term or any renewal period, the lessor must first offer to sell it to us at its fair market
value. Additionally, we have the right of first refusal of any third party offers to buy the facility after the initial term.

Purchase
Commitments

As of December 31, 2006, we have entered into contracts with various providers to purchase certain other property and
equipment. These future commitments will result in expected payments of $66 million in 2007 and $17 million in 2008.

Transportation
Contracts

We have entered firm transportation contracts with various pipelines. Under these contracts we are obligated to transport
minimum daily gas volumes, as calculated on a monthly basis, or pay for any deficiencies at a specified reservation fee rate. Our production committed to these pipelines is expected to exceed the minimum daily volumes provided in the contracts. We
have generally delivered at least minimum volumes under our firm transportation contracts, therefore avoiding payment for deficiencies. As of December 31, 2006, maximum commitments under our transportation contracts were as follows:



|              |  |   |    
|------------- |  | - | ---
|(in millions) |  |  
|2007          |  | $ | 61 
|2008          |  |   | 69 
|2009          |  |   | 74 
|2010          |  |   | 73 
|2011          |  |   | 66 
|Remaining     |  |   | 295
|              |  |   |    
|              |  | $ | 638
|              |  |   |    

In October 2005, we entered into a ten-year firm transportation agreement that commences upon
completion of a new 168-mile pipeline spanning from East Texas to northeast Louisiana. Upon the pipelines completion, currently expected in second quarter 2007, we will transport daily gas volumes for a minimum monthly transportation fee of $3
million plus fuel ranging from 0.8% to 1.6%, depending on receipt point and other conditions.

In December 2006, we entered into a ten-year
firm transportation contract that commences upon completion of a new 502-mile pipeline spanning from southeast Oklahoma to east Alabama. Upon the pipelines completion, currently expected in first quarter 2009, we will transport gas volumes for
a minimum transportation fee of $2 million per month plus fuel not to exceed 1.2%, depending on receipt point and other conditions.

The
potential effect of these agreements is not included in the above summary of our transportation contract commitments since our commitment is contingent upon completion of the pipelines.

Guarantees

Under the terms of some
of our operating leases for compressors, airplanes and vehicles, we have various residual value guarantees and other payment provisions upon our election to return the equipment under certain specified conditions. As of December 31, 2006, we
estimate the total contingent payable under these guarantees does not exceed $5 million.



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Employment Agreements

Three executive officers entered into year-to-year employment agreements with us in May 2006. The agreements are automatically renewed each year-end
unless terminated by either party upon thirty days notice prior to each November 30. Under these agreements, the officers receive a minimum annual salary of $1,200,000, $675,000 and $540,000, respectively, and are entitled to participate in any
incentive compensation programs administered by the Board of Directors. The agreement also provides that, in the event (i) the officer terminates his employment for good reason, as defined in the agreement, (ii) we terminate the employee
without cause, (iii) the officer dies or becomes disabled, or (iv) a change in control of the Company occurs, the officer is entitled to a lump-sum payment of three times the officers most recent annual compensation, including any
special bonuses or other compensation required to be designated as a bonus under the rules and regulations of the Securities and Exchange Commission. In addition, the officer is entitled to receive a payment sufficient to make the officer whole for
any excise tax on excess parachute payments imposed by the Internal Revenue Code.

Upon retirement, each of these officers will enter into
an eighteen-month consulting agreement under which the officer will receive a monthly payment based on his annual salary at the time of retirement, plus $10,000 a month for expenses. The officer will also become fully vested in any outstanding
share-based awards unless otherwise provided in the award agreement (Note 12).

Commodity Commitments

We have entered into futures contracts, collars and swap agreements that effectively fix gas and oil prices. See Note 8.

Drilling Contracts

As of
December 31, 2006, we have contracts with various drilling contractors to use 63 drilling rigs in 2007 with terms of up to three years and minimum future commitments of $171 million in 2007, $49 million in 2008 and $17 million in 2009. Early
termination of these contracts at December 31, 2006 would have required us to pay maximum penalties of $119 million. We do not expect to pay any early termination penalties related to these contracts.

Litigation

On October 17, 1997,
an action, styled United States of America ex rel. Grynberg v. Cross Timbers Oil Company, et al., was filed in the U.S. District Court for the Western District of Oklahoma by Jack J. Grynberg on behalf of the United States under the qui
tam provisions of the U.S. False Claims Act against the Company and certain of our subsidiaries. The plaintiff alleges that we underpaid royalties on natural gas produced from federal leases and lands owned by Native Americans in amounts in
excess of 20% as a result of mismeasuring the volume of natural gas, incorrectly analyzing its heating content and improperly valuing the natural gas during at least the past ten years. The plaintiff seeks treble damages for the unpaid royalties
(with interest, attorney fees and expenses), civil penalties between $5,000 and $10,000 for each violation of the U.S. False Claims Act, and an order for us to cease the allegedly improper measuring practices. This lawsuit against us and similar
lawsuits filed by Grynberg against more than 300 other companies were consolidated in the United States District Court for Wyoming. In October 2002, the court granted a motion to dismiss Grynbergs royalty valuation claims, and Grynbergs
appeal of this decision was dismissed for lack of appellate jurisdiction in May 2003. In response to a motion to dismiss filed by us and other defendants, in October 2006 the district judge held that Grynberg failed to establish jurisdictional
requirements to maintain the action against us and other defendants and dismissed the action for lack of subject matter jurisdiction. Grynberg has filed an appeal of this decision. The district judge did not dismiss those claims against us
pertaining to the royalty value of carbon dioxide. While we are unable to predict the final outcome of this case, we believe that the allegations of this lawsuit are without merit and intend to vigorously defend the action. Any potential liability
from this claim cannot currently be reasonably estimated, and no provision has been accrued in our financial statements.



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In June 2001, we were served with a lawsuit styled Price, et al. v. Gas Pipelines, et al.The
action was filed in the District Court of Stevens County, Kansas, against us and one of our subsidiaries, along with over 200 natural gas transmission companies, producers, gatherers and processors of natural gas. The plaintiffs seek to represent a
class of plaintiffs consisting of all similarly situated gas working interest owners, overriding royalty owners and royalty owners either from whom the defendants had purchased natural gas or who received economic benefit from the sale of such gas
since January 1, 1974. The allegations in the case are similar to those in the Grynberg case; however, the Price case broadens the claims to cover all oil and gas leases (other than the federal and Native American leases that are
the subject of the Grynberg case). The complaint alleges that the defendants have mismeasured both the volume and heating content of natural gas delivered into their pipelines, resulting in underpayments to the plaintiffs. The plaintiffs
assert a breach of contract claim, negligent or intentional misrepresentation, civil conspiracy, common carrier liability, conversion, violation of a variety of Kansas statutes and other common law causes of action. The amount of damages was not
specified in the complaint. In February 2002, we, along with one of our subsidiaries, were dismissed from the suit and another subsidiary of the Company was added. A hearing was held in January 2003, and the court held that a class should not be
certified. The plaintiffs counsel has filed an amended class action petition, which reduces the proposed class to only royalty owners, reduces the claims to mismeasurement of volume only, conspiracy, unjust enrichment and accounting, and only
applies to gas measured in Kansas, Colorado and Wyoming. The court held an evidentiary hearing in April 2005 to determine whether the amended class should be certified, and we are awaiting the decision of the court. While we are unable to predict
the outcome of this case, we believe that the allegations of this lawsuit are without merit and intend to vigorously defend the action. Any potential liability from this claim cannot currently be reasonably estimated, and no provision has been
accrued in our financial statements.

On August 5, 2003, the Price plaintiffs served one of our subsidiaries with a new
original class action petition styled Price, et al. v. Gas Pipelines, et al. The action was filed in the District Court of Stevens County, Kansas, against natural gas pipeline owners and operators. The plaintiffs seek to represent a class of
plaintiffs consisting of all similarly situated gas royalty owners either from whom the defendants had purchased natural gas or measured natural gas since January 1, 1974 to the present. The new petition alleges the same improper analysis of
gas heating content that had previously been alleged in the Price case discussed above until it was removed from the case by the filing of the amended class action petition. In all other respects, the new petition appears to be identical to
the amended class action petition in that it has a proposed class of only royalty owners, alleges conspiracy, unjust enrichment and accounting, and only applies to gas measured in Kansas, Colorado and Wyoming. The court held an evidentiary hearing
in April 2005 to determine whether the amended class should be certified, and we are awaiting the decision of the court. The amount of damages was not specified in the complaint. While we are unable to predict the outcome of this case, we believe
that the allegations of this lawsuit are without merit and intend to vigorously defend the action. Any potential liability from this claim cannot currently be reasonably estimated, and no provision has been accrued in our financial statements.

We are involved in various other lawsuits and certain governmental proceedings arising in the ordinary course of business. Our management
and legal counsel do not believe that the ultimate resolution of these claims, including the lawsuits described above, will have a material effect on our financial position or liquidity, although an unfavorable outcome could have a material adverse
effect on the operations of a given interim period or year.

Other

In May 2005, in recognition of the Chairman and Chief Executive Officer of the Company, in support of local education and to benefit our ongoing oil and
gas business endeavors in this area, the Board of Directors approved a pledge to contribute $3.1 million to a school in Fort Worth. Of this amount, $3 million is to be used for capital improvements. The remaining $100,000 is to be used for a
scholarship fund for economically disadvantaged students. This pledge is to be paid annually in four equal installments of $775,000, the first of which was paid in June 2005 with the remaining payments due in June of each subsequent year. The total
contribution was expensed as general and administrative expense in 2005. As of December 31, 2006, the remaining $1.6 million pledge payable is included in accounts payable and accrued liabilities.

To date, our expenditures to comply with environmental or safety regulations have not been significant and are not expected to be significant in the
future. However, new regulations, enforcement policies, claims for damages or other events could result in significant future costs.



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To secure tubular goods required to support our drilling program, we provide a forecast to a tubular
goods supplier who commits to deliver, at market prices, our next quarters tubular products. There is no minimum order requirement, and the forecast can be adjusted 60 to 90 days prior to shipment.

Through December 2006, we have acquired approximately 214,000 net acres in the Barnett Shale of North Texas. Many of these net acres are generally
subject to lease expiration if initial wells are not drilled within a specified period, generally not exceeding two years. We do not expect to lose significant lease acreage because of failure to drill due to inadequate capital, equipment or
personnel. However, based on our evaluation of prospective economics, we have allowed certain lease acreage to expire and may allow additional acreage to expire in the future.

In addition to drilling four wells to earn our 50% working interest in the 69,500 acres granted under our Piceance Basin farm-in agreement with
ExxonMobil Corporation (Note 13), we are required to continue to drill wells periodically to retain the undeveloped leasehold until the entire acreage position has been drilled.

See Note 2.

7. Financial Instruments

We use commodity-based and financial derivative contracts to manage exposures to commodity price and interest rate fluctuations. We do not hold or issue
derivative financial instruments for speculative or trading purposes. We also may enter gas physical delivery contracts to effectively provide gas price hedges. Because these contracts are not expected to be net cash settled, they are considered to
be normal sales contracts. Therefore, these contracts are not recorded in the financial statements.

All derivatives are recorded on the
balance sheet at estimated fair value. Fair value is generally determined based on the difference between the fixed contract price and the underlying market price at the determination date, and/or the value confirmed by the counterparty. Changes in
the fair value of effective cash flow hedges are recorded as a component of accumulated other comprehensive income, which is later transferred to earnings when the hedged transaction occurs. Changes in the fair value of derivatives that are not
designated as hedges, as well as the ineffective portion of the hedge derivatives, are recorded in derivative fair value (gain) loss in the income statement. This ineffective portion is calculated as the difference between the change in fair value
of the derivative and the estimated change in cash flows from the item hedged. Btu swap contracts do not qualify for hedge accounting.

Btu Swap Contracts

In 1995, we entered a contract to sell gas based on crude oil pricing, also referred to as the Enron Btu
swap contract. This contract was terminated as a result of the Enron bankruptcy in December 2001. Because the contract pricing was not clearly and closely associated with natural gas prices, it was considered a non-hedge derivative financial
instrument, with changes in fair value recorded as a derivative (gain) loss in the income statement.

Prior to termination of the Enron Btu
swap contract, we entered Btu swap contracts with another counterparty to effectively defer until August 2005 through July 2006 any cash flow impact related to 25,000 Mcf of daily gas deliveries in 2002 that were to be made under the Enron Btu swap
contract. Changes in fair value of these contracts were recorded as a derivative (gain) loss in the income statement. In March 2002, we terminated some of these contracts with maturities of May through December 2002 and received $7 million from the
counterparty.

Btu swap contracts outstanding at December 31, 2005 had a net fair value loss of $23 million. As of February 28,
2006, we terminated the remaining portion of these contracts, resulting in total payments to the counterparty of $7 million in first quarter 2006.



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Commodity Price Hedging Instruments

We periodically enter into futures contracts, energy swaps, collars and basis swaps to hedge our exposure to price fluctuations on crude oil and natural
gas sales. When actual commodity prices exceed the fixed price provided by these contracts, we pay this excess to the counterparty, and when actual commodity prices are below the contractually provided fixed price, we receive this difference from
the counterparty. See Note 8.

Derivative Fair Value (Gain) Loss

The components of derivative fair value (gain) loss, as reflected in the consolidated income statements are:



|                                                                                   |  |      |      |   |      |   |     |      |  |   |    |  
|---------------------------------------------------------------------------------- |  | ---- | ---- | - | ---- | - | --- | ---- |  | - | -- | -
|(in millions)                                                                      |  | 2006 |      |   | 2005 |   |     | 2004 | 
|Change in fair value of Btu swap contracts                                         |  | $    | (16  | ) |      | $ | 23  |      |  | $ | 1  |  
|Change in fair value of other derivatives that do not qualify for hedge accounting |  |      | (19  | ) |      |   | (37 | )    |  |   | (1 | )
|Ineffective portion of derivatives qualifying for hedge accounting                 |  |      | (67  | ) |      |   | 1   |      |  |   | 12 |  
|                                                                                   |  |      |      |   |      |   |     |      |  |   |    |  
|Derivative fair value (gain) loss                                                  |  | $    | (102 | ) |      | $ | (13 | )    |  | $ | 12 |  
|                                                                                   |  |      |      |   |      |   |     |      |  |   |    |  

The gains in 2006 and 2005 related to derivatives that do not qualify for hedge accounting are
primarily related to natural gas basis swap agreements. Except to the extent basis swap agreements are utilized in conjunction with NYMEX future contracts, they cannot qualify for hedge accounting.

Fair Value of Financial Instruments

Because of their short-term maturity, the fair value of cash and cash equivalents, accounts receivable and accounts payable approximates their carrying values at December 31, 2006 and 2005. The following are estimated fair values and
carrying values of our other financial instruments at each of these dates:



|                                                     |  |                   |        |   |                   |   |        |                |  |   |           |   |  |   |        |  
|---------------------------------------------------- |  | ----------------- | ------ | - | ----------------- | - | ------ | -------------- |  | - | --------- | - |  | - | ------ | -
|                                                     |  | Asset (Liability) |       
|                                                     |  | December 31, 2006 |        |   | December 31, 2005 |  
|(in millions)                                        |  | CarryingAmount    |        |   | FairValue         |   |        | CarryingAmount |  |   | FairValue |  
|Derivative Assets:                                   |  |                   |        |   |                   |   |        |                |  |   |           |   |  |   |        |  
|Fixed-price natural gas futures and swaps            |  | $                 | 669    |   |                   | $ | 669    |                |  | $ | 194       |   |  | $ | 194    |  
|Fixed-price crude oil futures and differential swaps |  |                   | 191    |   |                   |   | 191    |                |  |   |          |   |  |   |       |  
|                                                     |  |                   |        |  
|Derivative Liabilities:                              |  |                   |        |   |                   |   |        |                |  |   |           |   |  |   |        |  
|Fixed-price natural gas futures and swaps            |  |                   | (37    | ) |                   |   | (37    | )              |  |   | (50       | ) |  |   | (50    | )
|Fixed-price crude oil futures and differential swaps |  |                   | (1     | ) |                   |   | (1     | )              |  |   | (17       | ) |  |   | (17    | )
|Btu swap contracts                                   |  |                   |       |   |                   |   |       |                |  |   | (23       | ) |  |   | (23    | )
|                                                     |  |                   |        |   |                   |   |        |                |  |   |           |   |  |   |        |  
|Net derivative asset                                 |  | $                 | 822    |   |                   | $ | 822    |                |  | $ | 104       |   |  | $ | 104    |  
|                                                     |  |                   |        |   |                   |   |        |                |  |   |           |   |  |   |        |  
|Long-term debt                                       |  | $                 | (3,451 | ) |                   | $ | (3,427 | )              |  | $ | (3,109    | ) |  | $ | (3,154 | )
|                                                     |  |                   |        |   |                   |   |        |                |  |   |           |   |  |   |        |  

The fair value of futures, swap and differential agreements is estimated based on the
exchange-trade value of NYMEX, basis and differential contracts and market commodity prices for the applicable future periods. The fair value of bank borrowings approximates their carrying value because of short-term interest rate maturities. The
fair value of senior notes is based on current market quotes.



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Changes in fair value of derivative assets and liabilities are the result of changes in oil and gas
prices. Futures and swaps are generally designated as hedges of commodity price risks, and accordingly, changes in their values are predominantly recorded in accumulated other comprehensive income until the hedged transaction occurs.

Concentrations of Credit Risk

Although our cash equivalents, accounts receivable and derivative assets are exposed to the risk of credit loss, we do not believe such risk to be significant. Cash equivalents are high-grade, short-term securities, placed with highly rated
financial institutions. Most of our receivables are from a diverse group of companies including major energy companies, pipeline companies, local distribution companies and end-users in various industries. We currently have greater concentrations of
credit with several A- or better rated integrated energy companies. Financial and commodity-based swap contracts expose us to the credit risk of nonperformance by the counterparty to the contracts. This exposure is diversified among major investment
grade financial institutions, and we have master netting agreements with counterparties that provide for offsetting payables against receivables from separate derivative contracts. Letters of credit or other appropriate security are obtained as
considered necessary to limit risk of loss. Our allowance for collectibility of all accounts receivable was $5 million at December 31, 2006 and $4 million as of December 31, 2005.

8. Commodity Sales Commitments

Our policy is to
consider hedging a portion of our production at commodity prices management deems attractive. While there is a risk we may not be able to realize the benefit of rising prices, management may enter into hedging agreements because of the benefits of
predictable, stable cash flows.

In addition to selling gas under fixed price physical delivery contracts, we enter futures contracts,
energy swaps, collars and basis swaps to hedge our exposure to price fluctuations on natural gas and crude oil sales. When actual commodity prices exceed the fixed price provided by these contracts we pay this excess to the counterparty, and when
the commodity prices are below the contractually provided fixed price, we receive this difference from the counterparty. We have hedged a portion of our exposure to variability in future cash flows from natural gas sales through December 2007 and
from crude oil sales through December 2008.

Natural Gas

We have entered into natural gas futures contracts and swap agreements that effectively fix prices for the production and periods shown below. Prices to
be realized for hedged production may be less than these fixed prices because of location, quality and other adjustments. See Note 7 regarding accounting for commodity hedges.



|                  |  |                                      |  |                           |  |   |     
|----------------- |  | ------------------------------------ |  | ------------------------- |  | - | ----
|                  |  | Futures Contractsand Swap Agreements
|Production Period |  | Mcf per Day                          |  | AverageNYMEX Priceper Mcf
|2007              |  | January                              |  | 700,000                   |  | $ | 9.55
|                  |  | February                             |  | 800,000                   |  | $ | 9.33
|                  |  | March to December                    |  | 900,000                   |  | $ | 9.19



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The price we receive for our gas production is generally less than the NYMEX price because of adjustments
for delivery location (basis), relative quality and other factors. We have entered sell basis swap agreements that effectively fix the basis adjustment as shown below. Not all of our sell basis swap agreements are designated as hedges
for hedge accounting purposes.



|                  |  |                      |  |                                       |  |   |     
|----------------- |  | -------------------- |  | ------------------------------------- |  | - | ----
|Production Period |  | Mcf per Day          |  | Weighted AverageSell Basis per Mcf(a)
|2007              |  | January to March     |  | 460,000                               |  | $ | 0.66
|                  |  | April                |  | 410,000                               |  | $ | 0.35
|                  |  | May to October       |  | 210,000                               |  | $ | 0.47
|                  |  | November to December |  | 90,000                                |  | $ | 0.39
|2008              |  | January to December  |  | 30,000                                |  | $ | 0.39

---

|(a) | Reductions to NYMEX gas prices for delivery location.
|--- | -----------------------------------------------------

Net settlements on futures and sell basis swap hedge contracts increased gas revenues by $618 million in 2006 and decreased gas revenue by $127 million in 2005 and $156 million in 2004. As of December 31, 2006, an unrealized pre-tax
derivative fair value gain of $599 million, related to cash flow hedges of gas price risk, was recorded in accumulated other comprehensive income. This gain is expected to be reclassified into earnings in 2007. The actual reclassification to
earnings will be based on mark-to-market prices at the contract settlement date. The settlement of futures contracts and sell basis swap agreements related to January 2007 gas production increased gas revenue by approximately $55 million, or $1.45
per Mcf.

Crude Oil

We
have entered into crude oil futures contracts and swap agreements that effectively fix prices for the production and periods shown below. Prices to be realized for hedged production may be less than these fixed prices because of location, quality
and other adjustments. See Note 7 regarding accounting for commodity hedges.



|                  |  |                                       |  |                           |  |   |      
|----------------- |  | ------------------------------------- |  | ------------------------- |  | - | -----
|                  |  | Futures Contracts and Swap Agreements
|Production Period |  | Bbls per Day                          |  | AverageNYMEX Priceper Bbl
|2007              |  | January to December                   |  | 37,500                    |  | $ | 74.40
|2008              |  | January to December                   |  | 22,500                    |  | $ | 74.26

We have entered crude sweet and sour differential swaps of $5.27 per Bbl for 15,000 Bbls per day
of sour crude oil production for January 2007, and $5.14 per Bbl for 20,000 Bbls per day for February to December 2007.

Net gains on
futures and differential swap hedge contracts increased oil revenue by $3 million in 2006, and net losses reduced oil revenue by $75 million in 2005 and $15 million in 2004. As of December 31, 2006, an unrealized pre-tax derivative fair value
gain of $176 million related to cash flow hedges of oil price risk was recorded in accumulated other comprehensive income. Based on December 31 mark-to-market prices, $123 million of this gain is expected to be reclassified into earnings in
2007. The actual reclassification to earnings will be based on mark-to-market prices at the contract settlement date. The settlement of futures contracts, swap agreements and differential swap contracts related to January 2007 production increased
oil revenue by approximately $22 million, or $15.00 per Bbl.



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Transportation Contracts

In connection with our commitments under our transportation contracts (Note 6), we have entered purchase basis swap agreements related to potential
purchase of gas volumes to be transported. Purchase basis swap agreements are not designated as hedges for hedge accounting purposes.



|       |  |                      |  |                                           |  |   |     
|------ |  | -------------------- |  | ----------------------------------------- |  | - | ----
|Period |  | Mcf per Day          |  | Weighted AveragePurchase Basis per Mcf(a)
|2007   |  | January              |  | 125,000                                   |  | $ | 1.01
|       |  | February to March    |  | 120,000                                   |  | $ | 1.01
|       |  | April to October     |  | 30,000                                    |  | $ | 0.79
|       |  | November to December |  | 10,000                                    |  | $ | 0.62
|2008   |  | January to March     |  | 10,000                                    |  | $ | 0.62

---

|(a) | Reductions to NYMEX gas prices for purchase location.
|--- | -----------------------------------------------------

Physical Delivery Contracts

In 1998, we sold a production payment, payable from future production from certain properties
acquired in an acquisition, to EEX Corporation for $30 million. The acquisition was recorded net of the sale of the production payment. Under the terms of the production payment conveyance and related delivery agreement, we committed to deliver to
EEX a total of approximately 34.3 Bcf of gas during the 10-year period beginning January 1, 2002, with scheduled deliveries by year, subject to certain variables. EEX will reimburse us for all royalty and production and property tax payments
related to such deliveries. EEX will also pay us an operating fee of $0.257 per Mcf for deliveries, which fee will be escalated annually at a rate of 5.5%. In 2001 and 2002, we repurchased 18.3 Bcf (14.8 Bcf net) of gas under the production payment
for $21 million. We began delivery of the remaining 16.0 Bcf of gas in September 2006. As of December 31, 2006, remaining volumes to be delivered under this commitment are 15.0 Bcf.

9. Equity

Stock Splits

We effected a five-for-four stock split on March 17, 2004 and a four-for-three stock split on March 15, 2005. All common stock shares, treasury
stock shares and per share amounts have been retroactively restated to reflect these stock splits.

Common Stock

The following reflects our common stock activity:



|                                                                                   |  |               |  |                    |  |         |  |       |  |       |  |      
|---------------------------------------------------------------------------------- |  | ------------- |  | ------------------ |  | ------- |  | ----- |  | ----- |  | -----
|                                                                                   |  | Shares Issued |  | Shares in Treasury
|(in thousands)                                                                     |  | 2006          |  | 2005               |  | 2004    |  | 2006  |  | 2005  |  | 2004 
|Balance, January 1                                                                 |  | 365,221       |  | 348,428            |  | 312,335 |  | 1,655 |  | 1,250 |  |     
|Issuance/vesting and forfeiture of performance, restricted and unrestricted shares |  | 1,217         |  | 433                |  | 2,448   |  | 65    |  | 405   |  | 1,216
|Stock option and warrant exercises                                                 |  | 2,481         |  | 3,027              |  | 1,937   |  |      |  |      |  |     
|Treasury stock purchases                                                           |  |              |  |                   |  |        |  | 2,200 |  |      |  | 34   
|Common stock offering                                                              |  |              |  |                   |  | 31,708  |  |      |  |      |  |     
|Issuance for acquisition of corporation                                            |  | 2,555         |  | 13,333             |  |        |  |      |  |      |  |     
|                                                                                   |  |               |  |                    |  |         |  |       |  |       |  |      
|Balance, December 31                                                               |  | 371,474       |  | 365,221            |  | 348,428 |  | 3,920 |  | 1,655 |  | 1,250
|                                                                                   |  |               |  |                    |  |         |  |       |  |       |  |      



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Our acquisition of Peak Energy Resources, Inc. in June 2006 was partially funded through issuance to the
seller of 2.555 million shares of common stock (Note 13). We registered these shares under our shelf registration statement (see below) in June 2006.

Our acquisition of Antero Resources Corporation in April 2005 was partially funded through issuance to the seller of 13.3 million shares of common stock (Note 13). We filed a shelf registration with the
Securities and Exchange Commission for the resale of the common stock including shares to be issued upon exercise of warrants. See Common Stock Warrants below.

In May 2004, we completed a public offering of 31.7 million shares of common stock at $18.92 per share. After underwriting discount and other offering costs of $20 million, net proceeds of $580 million were used
to reduce bank borrowings that funded our producing property acquisitions from ExxonMobil Corporation and our deposit on the ChevronTexaco acquisition (Note 13).

Treasury Stock

In August 2004, our Board of Directors authorized the repurchase of up to
20 million shares of our common stock which may be purchased from time to time in open market or negotiated transactions. This authorization effectively replaced the share repurchase authorization remaining from May 2000. In June 2006, we
repurchased 2.2 million shares of our common stock on the open market at $37.80 per share, or a total of $83 million. As of December 31, 2006, we have repurchased 2,233,600 shares.

Stockholder Rights Plan

In August
1998, the Board of Directors adopted a stockholder rights plan that is designed to assure that all stockholders receive fair and equal treatment in the event of any proposed takeover of the Company. Under this plan, one preferred share purchase
right is attached to each outstanding share of common stock. Each right entitles stockholders to buy one one-thousandth of a share of newly created Series A Junior Participating Preferred Stock at an exercise price of $80, subject to adjustment in
the event a person acquires or makes a tender or exchange offer for 15% or more of the outstanding common stock. In such event, each right entitles the holder (other than the person acquiring 15% or more of the outstanding common stock) to purchase
shares of common stock with a market value of twice the rights exercise price. At any time prior to such event, the Board of Directors may redeem the rights at one cent per right. The rights can be transferred only with common stock and expire
in August 2008.

Shelf Registration Statement

In June 2006, we filed a shelf registration statement with the Securities and Exchange Commission to potentially offer securities which could include debt securities or common stock. The securities will be offered at
prices and on terms to be determined at the time of sale. Net proceeds from the sale of such securities will be used for general corporate purposes, including reduction of bank debt.

Common Stock Warrants

Our purchase
of Antero Resources Corporation was partially funded by issuance of warrants to purchase 2.1 million shares of common stock at $25.97 per share (Note 13). The warrants expire in March 2010.

Common Stock Dividends

The Board of
Directors declared quarterly dividends of $0.0075 per common share for first and second quarter 2004, $0.0375 per common share for third and fourth quarter 2004, $0.05 per common share for the first three quarters of 2005, $0.075 per common share
for fourth quarter 2005 and first three quarters 2006 and $0.09 per common share for fourth quarter 2006. On February 20, 2007, the Board of Directors declared a $0.12 per common share dividend for first quarter 2007.

In January 2006, the Board of Directors declared a dividend to common stockholders, consisting of all 21.7 million Hugoton Royalty Trust units owned
by us. The dividend ratio of 0.059609 trust units for each common share



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outstanding was set on the record date of April 26, 2006. The units were distributed on May 12, 2006, when this dividend was recorded. We recorded
this dividend at $614 million, or approximately $1.687 per common share, the fair market value of the units based on the May 12, 2006 average high and low New York Stock Exchange trade price of $28.31.

The determination of the amount of future dividends, if any, to be declared and paid is at the sole discretion of the Board of Directors and will depend
on our financial condition, earnings and cash flow from operations, the level of our capital expenditures, our future business prospects and other matters the Board of Directors deems relevant.

See Note 12.

10. Earnings Per Share

The following reconciles earnings (numerator) and shares (denominator) used in the computation of basic and diluted earnings per share:



|                                     |  |          |       |        |       |                   |   |     
|------------------------------------ |  | -------- | ----- | ------ | ----- | ----------------- | - | ----
|(in millions, except per share data) |  | Earnings |       | Shares |       | Earningsper Share
|2006                                 |  |          |       |        |       |                  
|Basic                                |  | $        | 1,860 |        | 364.8 |                   | $ | 5.10
|                                     |  |          |       |        |       |                   |   |     
|Effect of dilutive securities:       |  |          |       |        |       |                   |   |     
|Stock options                        |  |          |      |        | 4.1   |                   |   |     
|Warrants                             |  |          |      |        | 0.9   |                   |   |     
|                                     |  |          |       |        |       |                   |   |     
|Diluted                              |  | $        | 1,860 |        | 369.8 |                   | $ | 5.03
|                                     |  |          |       |        |       |                   |   |     
|2005                                 |  |          |       |        |       |                  
|Basic                                |  | $        | 1,152 |        | 358.4 |                   | $ | 3.21
|                                     |  |          |       |        |       |                   |   |     
|Effect of dilutive securities:       |  |          |       |        |       |                   |   |     
|Stock options                        |  |          |      |        | 6.8   |                   |   |     
|Warrants                             |  |          |      |        | 0.4   |                   |   |     
|                                     |  |          |       |        |       |                   |   |     
|Diluted                              |  | $        | 1,152 |        | 365.6 |                   | $ | 3.15
|                                     |  |          |       |        |       |                   |   |     
|2004                                 |  |          |       |        |       |                  
|Basic                                |  | $        | 508   |        | 332.9 |                   | $ | 1.53
|                                     |  |          |       |        |       |                   |   |     
|Effect of dilutive securities:       |  |          |       |        |       |                   |   |     
|Stock options                        |  |          |      |        | 2.8   |                   |   |     
|                                     |  |          |       |        |       |                   |   |     
|Diluted                              |  | $        | 508   |        | 335.7 |                   | $ | 1.51
|                                     |  |          |       |        |       |                   |   |     

11. Supplemental Cash Flow Information

The consolidated statements of cash flows exclude the following non-cash transactions:



| | - |  | Distribution of 21.7 million Hugoton Royalty Trust units as a dividend to common stockholders in May 2006 (Note 9)
| | - |  | ------------------------------------------------------------------------------------------------------------------



| | - |  | Non-cash components of the June 2006 Peak Energy Resources acquisition purchase price, including issuance of 2.555 million shares of common stock and
assumption of other liabilities (Note 13)
| | - |  | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | - |  | Exchange of producing properties with ConocoPhillips in March 2005 and Occidental Petroleum in September 2005 (Note 13)
| | - |  | -----------------------------------------------------------------------------------------------------------------------



| | - |  | Non-cash components of the April 2005 Antero Resources acquisition purchase price, including issuance of 13.3 million shares of common stock and warrants to
purchase 2.1 million shares of common stock, and assumption of debt and other liabilities (Note 13)
| | - |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



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| | - |  | Exchange of nonstrategic working and royalty interests for nonproducing acres in August 2004 (Note 2)
| | - |  | -----------------------------------------------------------------------------------------------------



| | - |  | Grants of 1.0 million restricted shares in 2006
| | - |  | -----------------------------------------------



| | - |  | Grants and immediate vesting of unrestricted common shares to nonemployee directors totaling 20,000 shares in 2006 and 18,000 shares in each of 2005 and 2004
| | - |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------



| | - |  | The following performance share activity (Note 12):
| | - |  | ---------------------------------------------------



| | - |  | Grants of 150,000 shares in 2006, 414,000 shares in 2005 and 2.6 million shares in 2004
| | - |  | ---------------------------------------------------------------------------------------



| | - |  | Vesting of 161,000 shares in 2006, 1.1 million in 2005 and 3.2 million shares in 2004
| | - |  | -------------------------------------------------------------------------------------

Interest payments in 2006 totaled $172 million (including $18 million of capitalized interest), $150 million in 2005 (including $6 million of capitalized
interest) and $77 million in 2004 (including $3 million of capitalized interest). Net income tax payments were $556 million during 2006, $248 million during 2005 and $50 million during 2004.

Prior to January 1, 2006, we did not recognize compensation expense related to stock options granted. Because of this, the tax benefit realized upon
exercise of stock options has been recorded as an increase in additional paid-in capital. This tax benefit has decreased our current income tax payable and, as reflected in our consolidated statements of cash flows, has increased our cash provided
by operating activities by $21 million in 2005 and $18 million in 2004. Upon adoption of SFAS 123R (Note 12), this tax benefit for 2006 of $50 million has been classified as cash provided by financing activities.

12. Employee Benefit Plans

401(k) Plan

We sponsor a 401(k) benefit plan that allows employees to contribute and defer a portion of their wages. We match employee
contributions of up to 10% of wages, subject to annual dollar maximums established by the federal government. Employee contributions vest immediately while our matching contributions vest 100% upon completion of three years of service. All employees
over 21 years of age may participate. Company contributions under the plan were $11 million in 2006, $9 million in 2005 and $7 million in 2004.

Post-Retirement Health Plan

Effective January 1, 2001, we adopted a medical plan for employees who retire at age 55 or
over, as well as directors age 55 or over, with a minimum of five years service. During 2003, our retiree medical plan was amended to provide benefits to employees and directors when their combined age and qualified years of service total 60, with a
minimum age of 45 and a minimum of five years of service. Benefits under the plan are the same as for active employees, and continue until the retired employee or director or dependents are eligible for Medicare or another similar state health
insurance program. Post-retirement medical benefits are not prefunded but are paid when incurred. The plans benefit obligation, funded status and net periodic benefit cost for 2006, 2005 and 2004 are as follows:



|                                                                                          |  |             |    |   |      |   |    |      |  |   |    |  
|----------------------------------------------------------------------------------------- |  | ----------- | -- | - | ---- | - | -- | ---- |  | - | -- | -
|(in millions)                                                                             |  | December 31 |   
|                                                                                          |  | 2006        |    |   | 2005 |   |    | 2004 | 
|Benefit obligation at December 31                                                         |  | $           | 8  |   |      | $ | 7  |      |  | $ | 4  |  
|Funded status                                                                             |  | $           | (8 | ) |      | $ | (7 | )    |  | $ | (4 | )
|Net periodic benefit cost                                                                 |  | $           | 1  |   |      | $ | 1  |      |  | $ | 1  |  
|Accrued benefit liability, as recognized in the consolidated balance sheet at December 31 |  | $           | (8 | ) |      | $ | (5 | )    |  | $ | (4 | )



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During December 2006, we adopted the provisions of SFAS No. 158, Employers Accounting for
Defined Benefit Pension and Other Postretirement PlansAn Amendment of FASB Statements No. 87, 88, 106, and 132Rthat required us to recognize in our consolidated balance sheet a liability for the underfunded status of our
post-retirement health plan as of December 31, 2006. This liability, which is equal to the amount shown in the table above, is included as part of other long-term liabilities. The underfunded portion of $3 million, net of a deferred tax asset
of $1 million, was recorded as a reduction to accumulated other comprehensive income. After 2006, changes in the funded status of the plan will be included in comprehensive income in the year during which the changes occur.

Unrecognized net actuarial loss is amortized to expense over the estimated average remaining service life of plan participants and prior service cost is
amortized over a remaining life of four years. Including such amortization, the 2007 accrued benefit cost is expected to be approximately $2 million.

The following are assumptions used by us to determine our benefit obligation as of December 31 of each of the years presented:



|                                                                              |  |      |   |  |      |   |  |      |  
|----------------------------------------------------------------------------- |  | ---- | - |  | ---- | - |  | ---- | -
|                                                                              |  | 2006 |   |  | 2005 |   |  | 2004 |  
|Weighted average discount rate                                                |  | 6    | % |  | 6    | % |  | 6    | %
|Health care cost trend rate assumed for the following year                    |  | 9    | % |  | 8.5  | % |  | 9    | %
|Rate to which the cost trend rate is assumed to decline (ultimate trend rate) |  | 6    | % |  | 6    | % |  | 6    | %
|Year that the rate reaches the ultimate trend rate                            |  | 2013 |   |  | 2010 |   |  | 2010 |  

Assumed health care cost trends have a significant effect on the amounts reported for health care
plans. A one percentage point change in assumed health care cost trend rates would have a $1 million effect or less on both total service and interest cost and the post-retirement benefit obligation as of December 31, 2006.

Through 2016, projected benefit payments, which reflect expected future service, are not expected to exceed $800,000 in any one year and are less than $5
million in total.

Stock Incentive Plans

In November 2004, stockholders approved the 2004 Stock Incentive Plan under which 24 million shares of common stock were available for grants of stock awards. In May 2006, stockholders approved certain amendments
to the 2004 Plan including increasing the shares available for grants of stock awards to 33.75 million shares. Prior to approval of the 2004 Plan, grants of stock awards were made pursuant to the 1998 Stock Incentive Plan. No further grants
will be made under the 1998 Plan. Stock award grants are subject to certain limitations as specified in the Plan. The maximum term of stock awards is ten years under the 1998 Plan and seven years under the 2004 Plan. As a result of the May 12,
2006 distribution of the Hugoton Royalty Trust units (Note 9), appropriate antidilution adjustments were made to stock awards outstanding on that date.



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Stock awards under the 2004 Plan include stock options, performance shares, restricted shares and
unrestricted shares. The table below summarizes stock incentive compensation expense included in the consolidated financial statements and related amounts for each year:



|                                                                       |  |             |     |      |   |      |  |   |   
|---------------------------------------------------------------------- |  | ----------- | --- | ---- | - | ---- |  | - | --
|                                                                       |  | December 31
|(in millions)                                                          |  | 2006        |     | 2005 |   | 2004
|Non-cash stock option compensation expense                             |  | $           | 53  |      | $ |     |  | $ |  
|Non-cash performance share and unrestricted share compensation expense |  |             | 8   |      |   | 34   |  |   | 67
|Non-cash restricted stock compensation expense                         |  |             | 2   |      |   |     |  |   |  
|Cash-equivalent performance share expense                              |  |             |    |      |   |     |  |   | 22
|Related tax benefit recorded in income statement                       |  |             | 23  |      |   | 12   |  |   | 34
|Intrinsic value of stock option exercises                              |  |             | 136 |      |   | 60   |  |   | 48
|Excess income tax benefit on exercise of stock options (a)             |  |             | 50  |      |   | 21   |  |   | 18
|Grant date fair value of stock options vested                          |  |             | 24  |      |   | 78   |  |   | 20
|Share-based liabilities at year-end                                    |  |             |    |      |   |     |  |   |  

---

|(a) | Recorded as additional paid-in-capital
|--- | --------------------------------------

Included
in stock option compensation expense in 2006 is $36 million related to options granted during May 2006, which were subject to accelerated vesting provisions upon retirement under employment agreements. Under SFAS No. 123R, stock option awards
subject to such vesting provisions granted to retirement-eligible employees are expensed upon grant rather than over the expected vesting period (Note 6). In 2005 and prior, before adoption of SFAS No. 123R, performance share compensation was
recorded at the vesting price, recognized ratably over the estimated vesting period or at actual vesting, if earlier or if the vesting period could not be reasonably assessed.

Stock Options

Stock options granted
under the 2004 Plan generally vest and become exercisable ratably over a three-year period, and may include a provision for accelerated vesting when the common stock price reaches specified levels as determined by the Compensation Committee of the
Board of Directors. Some stock options granted in 2006 vest only when the common stock reaches specified levels. There was a total of 19.8 million options outstanding under the 2004 Plan and the 1998 Plan at December 31, 2006, including
13.6 million that were exercisable at that date. Of the remaining options, 5.7 million vest over three years at a rate of one-third at each grant anniversary date, 0.3 million vested when the stock price closed above $52.50 in February
2007 and 0.2 million vest when the stock price closes at or above $57.50.

The following summarizes option activity and balances for the
year ended December 31, 2006:



|                                 |  |                               |       |                             |        |   |                                          |     |                                       |   |    
|-------------------------------- |  | ----------------------------- | ----- | --------------------------- | ------ | - | ---------------------------------------- | --- | ------------------------------------- | - | ---
|                                 |  | Weighted-AverageExercisePrice |       | Stock Options(in thousands) |        |   | Weighted-AverageRemainingTerm (in years) |     | AggregateIntrinsicValue (in millions)
|Balance at January 1, 2006       |  | $                             | 23.82 |                             | 20,202 |   |                                          |     |                                       |   |    
|Grants                           |  |                               | 42.91 |                             | 5,428  |   |                                          |     |                                       |   |    
|Exercises                        |  |                               | 21.44 |                             | (5,699 | ) |                                          |     |                                       |   |    
|Forfeitures                      |  |                               | 36.73 |                             | (106   | ) |                                          |     |                                       |   |    
|                                 |  |                               |       |                             |        |   |                                          |     |                                       |   |    
|Balance at December 31, 2006     |  |                               | 29.66 |                             | 19,825 |   |                                          | 5.4 |                                       | $ | 345
|                                 |  |                               |       |                             |        |   |                                          |     |                                       |   |    
|Exercisable at December 31, 2006 |  |                               | 24.53 |                             | 13,654 |   |                                          | 5.0 |                                       | $ | 308
|                                 |  |                               |       |                             |        |   |                                          |     |                                       |   |    

As a result of options exercised in 2006, outstanding common stock increased by 2.5 million
shares and stockholders equity increased by $28 million.



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Performance Shares

Performance shares granted under the 2004 Plan are subject to restrictions determined by the Compensation Committee of the Board of Directors and are subject to forfeiture if performance criteria are not met.
Otherwise, holders of performance shares generally have all the voting, dividend and other rights of other common stockholders. To date, the performance criteria for all awards has been the achievement of specified increases in the common stock
price above the market price at the grant date. The following summarizes performance share activity for each year:



|                                                               |  |             |       |      |   |       |  |   |      
|-------------------------------------------------------------- |  | ----------- | ----- | ---- | - | ----- |  | - | -----
|                                                               |  | December 31
|(in thousands, except per share amounts)                       |  | 2006        |       | 2005 |   | 2004 
|Shares granted to key employees (a)                            |  |             | 150   |      |   | 414   |  |   | 2,576
|Shares vested when common stock price reached specified levels |  |             | 161   |      |   | 1,056 |  |   | 3,240
|Weighted average fair value of shares when granted (b)         |  | $           | 33.47 |      | $ | 36.98 |  | $ | 20.94
|                                                               |  |             |      
|(in millions)                                                  |  |             |       |      |   |      
|Treasury stock purchases related to vested shares              |  | $           | 3     |      | $ | 14    |  | $ | 24   

---

|(a) | Performance share grants in 2006 and 2005 were to key employees other than executive officers.
|--- | ----------------------------------------------------------------------------------------------

|(b) | Based on fair value in 2006 and intrinsic value at vesting in 2005 and 2004. Fair value was determined using a Monte Carlo simulation model. For further discussion of
determination of fair value, see Estimated Fair Value of Grants below.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

The following summarizes performance
shares outstanding at December 31, 2006 by vesting price:



|              |  |                  
|------------- |  | -----------------
|Vesting Price |  | PerformanceShares
|$53.17        |  | 1,250            
|55.00         |  | 72,437           
|65.00         |  | 71,438           
|              |  |                  
|              |  | 145,125          
|              |  |                  

Performance share grants in 2006 and 2005 were to key employees other than executive officers.
Prior to September 2004, most performance share awards were to executive officers. In September 2004, the Compensation Committee of the Board of Directors announced that it intended to restructure the Companys equity incentive program to
discontinue the use of performance shares for executive officers named in the proxy and to provide that all future grants to the officers would be in the form of options or other stock appreciation shares. As a result, in October 2004, the
Compensation Committee of the Board of Directors amended the change in control performance share grant agreements to delete the provisions regarding the grant of performance shares for every $0.75 increment in the price of the common stock and to
provide that, immediately prior to a change in control, these officers will receive a lump-sum cash payment equal to the value of 1,667,000 shares of common stock on the date of the change in control. A provision, providing that certain of these
officers will also receive a total grant of 517,000 performance shares immediately prior to a change in control without regard to the price of our common stock, has been revised to provide that such payment will be in cash and not in shares of
common stock. All amounts to be granted under these agreements will be adjusted for any future stock splits or other extraordinary transactions. If the named executive officers are subject to the 20% parachute excise tax, the Company will pay the
officer an additional amount to gross up the payment so that the officer will receive the full amount due under the terms of the amended change in control grant agreement after payment of the excise tax.



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Restricted Shares

In November 2006, we granted 1,047,000 restricted shares to key employees other than executive officers. These shares vest over three years, with one-third vesting at each grant anniversary date. Holders of restricted
shares generally have all the voting, dividend and other rights of other common stockholders.

Nonemployee Director Awards

Nonemployee directors are each eligible to receive discretionary stock awards under the 2004 Plan covering up to 20,000 shares
annually, as approved by the Corporate Governance and Nominating Committee and the Board of Directors. Nonemployee directors received automatic annual grants of unrestricted common shares that totaled 18,000 shares in 2004 under the 1998 Plan.
Nonemployee directors received a total of 20,000 unrestricted shares in February 2007 and 2006 and 18,000 unrestricted shares in February 2005 under the 2004 Plan. In November 2004, nonemployee directors were granted a total of 88,000 stock options
which vested in February 2005 when the common stock price reached specified levels. In November 2005, nonemployee directors received 96,000 stock options, 50% of which vested in 2005 when the common stock price closed above the target price of $45
and 50% which vested in 2006 when the common stock price closed above the target price of $50. In November 2006, nonemployee directors received 96,000 stock options, 50% of which vested when the stock closed above the target price of $52.50 in
February 2007 and 50% which vest when the common stock price closes at or above the target price of $57.50.

Nonvested Stock Awards

The following summarizes the status of the nonvested stock options, performance shares and restricted shares as of December 31,
2006 and changes for the year ended December 31, 2006:



|                                         |  |                                      |       |                |                    |   |                                      |                   |                |  |      |                                      |  |                |       |  |      
|---------------------------------------- |  | ------------------------------------ | ----- | -------------- | ------------------ | - | ------------------------------------ | ----------------- | -------------- |  | ---- | ------------------------------------ |  | -------------- | ----- |  | -----
|                                         |  | Stock Options                        |       |                | Performance Shares |   |                                      | Restricted Shares
|(in thousands, except per share amounts) |  | Weighted-AverageGrant DateFair Value |       | NumberofShares |                    |   | Weighted-AverageGrant DateFair Value |                   | NumberofShares |  |      | Weighted-AverageGrant DateFair Value |  | NumberofShares
|Nonvested at                             |  |                                      |       |                |                    |   |                                      |                   |                |  |      |                                      |  |                |       |  |      
|January 1, 2006                          |  | $                                    | 11.50 |                | 2,874              |   |                                      | $                 | 48.21          |  | 156  |                                      |  | $              |      |  |     
|Vested                                   |  |                                      | 11.88 |                | (2,025             | ) |                                      |                   | 47.73          |  | (161 | )                                    |  |                |      |  |     
|Grants                                   |  |                                      | 13.62 |                | 5,428              |   |                                      |                   | 33.47          |  | 150  |                                      |  |                | 47.85 |  | 1,047
|Forfeitures                              |  |                                      | 12.52 |                | (106               | ) |                                      |                   |               |  |     |                                      |  |                |      |  |     
|                                         |  |                                      |       |                |                    |   |                                      |                   |                |  |      |                                      |  |                |       |  |      
|Nonvested at                             |  |                                      |       |                |                    |   |                                      |                   |                |  |      |                                      |  |                |       |  |      
|December 31, 2006                        |  | $                                    | 13.22 |                | 6,171              |   |                                      | $                 | 33.51          |  | 145  |                                      |  | $              | 47.85 |  | 1,047
|                                         |  |                                      |       |                |                    |   |                                      |                   |                |  |      |                                      |  |                |       |  |      

As of December 31, 2006, the remaining unrecognized compensation expense related to nonvested
stock options was $49 million. Total deferred compensation at December 31, 2006 related to performance shares was $3 million and related to restricted shares was $46 million. For these nonvested stock awards at December 31, 2006, we
estimate that stock incentive compensation for service periods after December 31, 2006 will be $47 million in 2007, $34 million in 2008 and $17 million in 2009. The weighted-average remaining vesting period is 1.8 years for stock options, 1.5
years for performance shares and 2.9 years for restricted shares.

Estimated Fair Value of Grants

Prior to adoption of SFAS No. 123R, we used the Black-Scholes option-pricing model to estimate the fair value of stock options and the intrinsic
value method of valuing performance shares. Beginning January 1, 2006, we began using a lattice model to value stock option grants that time vest and a Monte Carlo simulation model to value performance shares and stock options that vest, or
include a provision for accelerated vesting, when the common stock price reaches specified levels.



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During 2006, we used both a trinomial lattice model and a Monte Carlo simulation model to determine the
fair value of options granted, and we used a Monte Carlo simulation model to determine the fair value of performance shares granted. For restricted stock grants, the fair value is equal to the closing price of our common stock on the grant date.

The trinomial lattice model requires inputs for risk-free interest rate, dividend yield, volatility, contract term, average vesting
period, post-vest turnover rate and suboptimal exercise factor. Both expected life and fair value are outputs of this model. The Monte Carlo simulation model requires inputs for risk-free interest rate, dividend yield, volatility, contract term,
target vesting price, post-vest turnover rate and suboptimal exercise factor. The suboptimal exercise factor does not affect the valuation of the performance shares since ownership is transferred at vesting. Expected life, derived vesting period and
fair value are outputs of this model.

The risk-free interest rate is based on the constant maturity nominal rates of U.S. Treasury
securities with remaining lives throughout the contract term on the day of the grant. The dividend yield is the expected common stock annual dividend yield over the expected life of the option or performance share, expressed as a percentage of the
stock price on the date of grant. The volatility factors are based on a combination of both the historical volatilities of our stock and the implied volatility of traded options on our common stock. Contract term is seven years. For options subject
to time vesting, the average vesting period is two years, based on each grant vesting ratably over a three-year period. For options subject to vesting when the common stock reaches a specified price, the target vesting price is specified by the
award. The post-vesting turnover rate is 3.5% and the suboptimal exercise factor is 1.6, and are both based on actual historical exercise activity. Estimates of fair value are not intended to predict actual future events or the value ultimately
realized by certain employees who receive stock option grants, and subsequent events are not indicative of the reasonableness of the original fair value estimates.

We record stock incentive compensation only for awards expected to vest. During 2006, we estimated annual forfeitures using a rate of 2.5% for stock options, 0% for performance shares and 2.5% for restricted shares.

For the fair value of stock options awarded before 2006, we used the Black-Scholes option pricing model which utilizes assumptions
different from those described above. The expected term was based on the historical exercise activity. The risk-free interest rate was the yield available on U.S. Treasury securities with a remaining term equal to the expected life of the option.
The dividend yield was determined in the same manner as described above for the lattice model. The volatility factor was based on the historical volatility of our common stock over the expected life of the option.

During 2006, we granted 5.4 million options with an estimated total grant-date fair value of $74 million and a weighted-average fair value of $13.62
per option. The estimated fair value of stock-based awards not expected to vest was less than $1 million. During the year ended December 31, 2005, we granted 4.2 million options with a weighted-average fair value of $10.20. During the year
ended December 31, 2004, we granted 16.2 million options with a weighted-average fair value of $5.34. Fair values were determined using the following assumptions:



|                                          |  |             |  |      |  |     
|----------------------------------------- |  | ----------- |  | ---- |  | ----
|                                          |  | 2006        |  | 2005 |  | 2004
|Weighted-average expected term (years)    |  | 4.4         |  | 3.5  |  | 3   
|Range of risk-free interest rates         |  | 4.3% - 5.2% |  |     |  |    
|Weighted-average risk-free interest rates |  | 4.9%        |  | 4.0% |  | 3.5%
|Dividend yield                            |  | 0.7%        |  | 0.7% |  | 0.6%
|Range of volatility                       |  | 29% - 35%   |  |     |  |    
|Weighted-average volatility               |  | 32%         |  | 35%  |  | 26% 



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13. Acquisitions

On February 28, 2006, we acquired proved and unproved properties in East Texas and Mississippi from Total E&P USA, Inc. for $300 million. The acquisition was funded by bank borrowings and is subject to
typical post-closing adjustments.

On June 30, 2006, we acquired Peak Energy Resources, Inc., which operates gas-producing properties
and owns unproved properties in the Barnett Shale in the Fort Worth Basin. The total purchase price is estimated to be $108 million, which was primarily funded by issuance of 2.555 million shares of common stock valued at $102 million (Note 9),
$5 million cash for additional leasehold interests and $1 million cash for other transaction costs. After recording estimated deferred taxes of $37 million and other liabilities, the purchase price allocated to proved properties was $97 million and
unproved properties was $54 million. The purchase price allocation is subject to adjustment, pending final determination of the tax bases and the fair value of certain assets acquired and liabilities assumed.

In March 2005, we traded nonoperated producing properties owned by us in the San Juan and Permian basins and in Alaska for producing properties owned by
ConocoPhillips in the East Texas Freestone Trend, the San Juan Basin and the Permian Basin Goldsmith Field. The properties exchanged by each party had an approximate value of $74 million. We accounted for this transaction as an exchange of similar
productive assets used in oil and gas producing activities, under APB Opinion No. 29 and SFAS No. 19, resulting in no gain or loss recognized on the exchange. We operate the properties that we received in this exchange.

To further establish our presence in the Barnett Shale in the Fort Worth Basin, we acquired Antero Resources Corporation on April 1, 2005. Antero
Resources owned operated gas-producing properties and unproved properties in the Barnett Shale. In the transaction, we paid cash of $342 million, issued 13.3 million shares of our common stock, and issued warrants that expire March 2010 to
purchase an additional 2.1 million shares of our common stock at $25.97 per share (as adjusted by antidilution adjustments resulting from the distribution of Hugoton Royalty Trust units (Note 9)). We also assumed $218 million of bank debt from
Antero. The cash portion of the acquisition was funded with borrowings under our revolving credit facility. At closing, bank debt assumed from Antero Resources was repaid with borrowings under our revolving credit facility.

The following is the final calculation of the purchase price of Antero Resources Corporation and the allocation to assets and liabilities as of
April 1, 2005. The fair value of consideration issued is determined as of January 10, 2005, the date the acquisition was announced.



|                                                                                                                 |  |               |      
|---------------------------------------------------------------------------------------------------------------- |  | ------------- | -----
|                                                                                                                 |  | (in millions)
|Consideration issued to Antero Resources stockholders:                                                           |  |               |      
|13.3 million shares of common stock (at fair value of $24.73 per share)                                          |  | $             | 330  
|Warrants to purchase 2.1 million shares of common stock at $25.97 per share (at fair value of $8.14 per warrant) |  |               | 17   
|                                                                                                                 |  |               |      
|                                                                                                                 |  |               | 347  
|Cash paid                                                                                                        |  |               | 342  
|                                                                                                                 |  |               |      
|Total purchase price                                                                                             |  |               | 689  
|                                                                                                                 | 
|Fair value of liabilities assumed:                                                                               |  |               |      
|Current liabilities                                                                                              |  |               | 114  
|Long-term debt                                                                                                   |  |               | 218  
|Asset retirement obligation                                                                                      |  |               | 4    
|Other long-term liabilities                                                                                      |  |               | 11   
|Deferred income taxes                                                                                            |  |               | 225  
|                                                                                                                 |  |               |      
|Total purchase price plus liabilities assumed                                                                    |  | $             | 1,261
|                                                                                                                 |  |               |      



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|                                                                      |  |   |      
|--------------------------------------------------------------------- |  | - | -----
|Fair value of assets acquired:                                        |  |   |      
|Cash and cash equivalents                                             |  | $ | 2    
|Other current assets                                                  |  |   | 55   
|Proved properties                                                     |  |   | 634  
|Unproved properties                                                   |  |   | 180  
|Other property and equipment, primarily gathering and pipeline assets |  |   | 35   
|Acquired gas gathering contracts                                      |  |   | 140  
|Goodwill (none deductible for income taxes)                           |  |   | 215  
|                                                                      |  |   |      
|Total fair value of assets acquired                                   |  | $ | 1,261
|                                                                      |  |   |      

In May 2005, we acquired producing properties in East Texas and northwestern Louisiana from Plains
Exploration & Production Company for an adjusted purchase price of $336 million. The acquisition was funded with borrowings under our revolving credit facility.

In June 2005, we entered an agreement with ExxonMobil Corporation to develop acreage in the northeastern portion of the Piceance Basin in northwest Colorado. Under the terms of the agreement, we will farm-in
approximately 69,500 contiguous gross acres east of ExxonMobils Piceance Creek Unit. We will operate and earn a 50% working interest ownership in the leasehold position by drilling four wells.

In July 2005, we acquired producing properties in the Permian Basin of West Texas and New Mexico from ExxonMobil Corporation for an adjusted purchase
price of $200 million. The acquisition was funded with borrowings under our revolving credit facility.

In September 2005, we traded
nonoperated producing properties in the Permian Basin of West Texas for producing properties owned by Occidental Petroleum in the Permian Basin of New Mexico. We accounted for this transaction as an exchange of nonmonetary assets in accordance with
SFAS No. 153. This exchange resulted in the recognition of a $10 million gain.

In January 2004, we acquired producing properties
located primarily in East Texas and northwestern Louisiana in three separate transactions totaling $243 million after adjustments of $6 million for net revenues, preferential right elections and other items from the effective date of the
transaction. The acquisitions were funded with a portion of the proceeds from the sale of 4.9% senior notes in January 2004 (Note 3).

From
February through April 2004, we purchased $223 million of properties located primarily in the Barnett Shale of North Texas and in the Arkoma Basin. Funding was provided by bank debt and cash flow from operations.

In two separate transactions during April 2004, we acquired predominantly oil-producing properties in the Permian Basin of West Texas and in the Powder
River Basin of Wyoming from ExxonMobil Corporation for a total adjusted purchase price of $336 million. The acquisitions were funded with bank borrowings that were repaid with proceeds from the sale of common stock in May 2004 (Note 9).

In May 2004, we entered an agreement with ChevronTexaco Corporation to acquire properties for a stated purchase price of $1.1 billion. The acquisition
closed in August 2004. After adjustments for net revenues from the January 1, 2004 effective date, preferential purchase right elections exercised in November and December 2004, and other typical closing adjustments, the adjusted purchase price
was approximately $958 million. The acquisition was funded through existing bank credit facilities and the sale of common stock in May 2004. These properties expanded our operations in the Permian Basin and our Eastern and Mid-Continent regions, and
added new coal bed methane properties in the Rocky Mountains and a new operating region in South Texas.

Two acquisitions in 2004 were
purchases of corporations that primarily owned producing and nonproducing properties. After purchase accounting adjustments, including a $72 million step-up adjustment for deferred income taxes, the cost of all proved properties acquired in 2004 was
$1.9 billion.



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Acquisitions were recorded using the purchase method of accounting. The following presents our unaudited
pro forma results of operations for 2005 and 2004, as if the 2005 Antero Resources acquisition, and the 2004 ChevronTexaco and ExxonMobil acquisitions were made at the beginning of each period. These pro forma results are not necessarily indicative
of future results.



|                                     |  |                        |       |      |   |      
|------------------------------------ |  | ---------------------- | ----- | ---- | - | -----
|                                     |  | Pro Forma (Unaudited) 
|(in millions, except per share data) |  | Year Ended December 31
|                                     |  | 2005                   |       | 2004
|Revenues                             |  | $                      | 3,555 |      | $ | 2,267
|                                     |  |                        |       |      |   |      
|Net income                           |  | $                      | 1,155 |      | $ | 566  
|                                     |  |                        |       |      |   |      
|Earnings per common share:           |  |                        |       |      |   |      
|Basic                                |  | $                      | 3.19  |      | $ | 1.59 
|                                     |  |                        |       |      |   |      
|Diluted                              |  | $                      | 3.13  |      | $ | 1.58 
|                                     |  |                        |       |      |   |      
|                                     |  |                       
|Weighted average shares outstanding: |  |                        |       |      |   |      
|Basic                                |  |                        | 361.7 |      |   | 355.5
|                                     |  |                        |       |      |   |      
|Diluted                              |  |                        | 369.0 |      |   | 358.3
|                                     |  |                        |       |      |   |      



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14. Quarterly Financial Data(Unaudited)

The following are summarized quarterly financial data for the years ended December 31, 2006 and 2005:



|                                     |  |         |       |     |   |       |     |  |     |       |  |   |      
|------------------------------------ |  | ------- | ----- | --- | - | ----- | --- |  | --- | ----- |  | - | -----
|(in millions, except per share data) |  | Quarter
|                                     |  | 1st     |       | 2nd |   |       | 3rd |  | 4th
|2006                                 |  |         |       |     |   |       |     |  |     |       |  |   |      
|Revenues                             |  | $       | 1,215 |     | $ | 1,066 |     |  | $   | 1,096 |  | $ | 1,199
|Gross profit (a)                     |  | $       | 809   |     | $ | 651   |     |  | $   | 659   |  | $ | 742  
|Net income                           |  | $       | 467   |     | $ | 597   | (c) |  | $   | 367   |  | $ | 429  
|Earnings per common share (b)        |  |         |       |     |   |       |     |  |     |       |  |   |      
|Basic                                |  | $       | 1.28  |     | $ | 1.64  |     |  | $   | 1.00  |  | $ | 1.17 
|Diluted                              |  | $       | 1.26  |     | $ | 1.62  |     |  | $   | 0.99  |  | $ | 1.16 
|Average shares outstanding           |  |         | 363.9 |     |   | 363.8 |     |  |     | 365.9 |  |   | 366.0
|                                     |  |         |       |    
|2005                                 |  |         |       |     |   |       |     |  |     |       |  |   |      
|Revenues                             |  | $       | 629   |     | $ | 749   |     |  | $   | 964   |  | $ | 1,177
|Gross profit (a)                     |  | $       | 336   |     | $ | 420   |     |  | $   | 572   |  | $ | 790  
|Net income                           |  | $       | 166   |     | $ | 220   |     |  | $   | 313   |  | $ | 453  
|Earnings per common share (b)        |  |         |       |     |   |       |     |  |     |       |  |   |      
|Basic                                |  | $       | 0.48  |     | $ | 0.61  |     |  | $   | 0.86  |  | $ | 1.25 
|Diluted                              |  | $       | 0.47  |     | $ | 0.60  |     |  | $   | 0.85  |  | $ | 1.22 
|Average shares outstanding           |  |         | 347.4 |     |   | 361.0 |     |  |     | 361.9 |  |   | 363.4

---

|(a) | Operating income before general and administrative expense.
|--- | -----------------------------------------------------------

|(b) | Because quarterly earnings per share is based on the weighted average shares outstanding during the quarter, the sum of quarterly earnings per share may not equal earnings
per share for the year.
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(c) | Included in second quarter net income is an after-tax gain on the distribution of Hugoton Royalty Trust units of $292 million (Note 9).
|--- | ---------------------------------------------------------------------------------------------------------------------------------------



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15. Supplementary Financial Information for Oil and Gas Producing Activities(Unaudited)

All of our operations are directly related to oil and gas producing activities located in the United States.

Costs Incurred Related to Oil and Gas Producing Activities

The following table summarizes costs incurred whether such costs are capitalized or expensed for financial reporting purposes:



|                                                   |  |      |       |      |   |       |  |   |       |    
|-------------------------------------------------- |  | ---- | ----- | ---- | - | ----- |  | - | ----- | ---
|(in millions)                                      |  | 2006 |       | 2005 |   | 2004  | 
|Acquisitions:                                      |  |      |       |      |   |       |  |   |       |    
|Proved properties                                  |  | $    | 561   |      | $ | 1,710 |  | $ | 1,949 | (a)
|Unproved propertiesacquisition of corporation (b) |  |      | 54    |      |   | 180   |  |   |      |    
|Unproved propertiesother                          |  |      | 171   |      |   | 92    |  |   | 50    |    
|Development (c)                                    |  |      | 2,022 |      |   | 1,341 |  |   | 570   |    
|Exploration                                        |  |      | 123   |      |   | 52    |  |   | 17    |    
|Asset retirement obligation accrued upon:          |  |      |       |      |   |       |  |   |       |    
|Acquisition                                        |  |      | 7     |      |   | 24    |  |   | 48    |    
|Development (d)                                    |  |      | 64    |      |   | 29    |  |   | 12    |    
|                                                   |  |      |       |      |   |       |  |   |       |    
|Total Costs Incurred                               |  | $    | 3,002 |      | $ | 3,428 |  | $ | 2,646 |    
|                                                   |  |      |       |      |   |       |  |   |       |    

---

|(a) | Includes a deferred income tax step-up adjustment of $72 million.
|--- | -----------------------------------------------------------------

|(b) | Represents a portion of the allocated purchase price of Peak Energy Resources, Inc. in 2006 and Antero Resources Corporation in 2005 (Note 13).
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------

|(c) | Includes capitalized interest of $18 million in 2006, $6 million in 2005 and $3 million in 2004.
|--- | ------------------------------------------------------------------------------------------------

|(d) | Includes revisions of $36 million in 2006, $16 million in 2005 and $6 million in 2004.
|--- | --------------------------------------------------------------------------------------

Proved Reserves

Our proved oil and gas reserves have been estimated by independent petroleum
engineers. Proved reserves are the estimated quantities that geologic and engineering data demonstrate with reasonable certainty to be recoverable in future years from known reservoirs under existing economic and operating conditions. Proved
developed reserves are the quantities expected to be recovered through existing wells with existing equipment and operating methods. Due to the inherent uncertainties and the limited nature of reservoir data, such estimates are subject to change as
additional information becomes available. The reserves actually recovered and the timing of production of these reserves may be substantially different from the original estimate. Revisions result primarily from new information obtained from
development drilling and production history and from changes in economic factors. Proved reserves exclude volumes deliverable to others under production payments.

Standardized Measure

The standardized measure of discounted future net cash flows and changes in
such cash flows are prepared using assumptions required by the Financial Accounting Standards Board. Such assumptions include the use of year-end prices for oil and gas and year-end costs for estimated future development and production expenditures
to produce year-end estimated proved reserves. Year-end prices are not adjusted for the effect of hedge derivatives. Discounted future net cash flows are calculated using a 10% rate. Estimated future income taxes are calculated by applying year-end
statutory rates to future pre-tax net cash flows, less the tax basis of related assets and applicable tax credits.

As of December 31,
2003, estimated well abandonment costs, net of salvage values, are deducted from the standardized measure using year-end costs and discounted at the 10% rate. As required by SFAS No. 143, such abandonment costs are recorded as a liability on
the consolidated balance sheet, using estimated values as of the projected abandonment date and discounted using a risk-adjusted rate at the time the well is drilled or acquired (Note 5).



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The standardized measure does not represent managements estimate of our future cash flows or the
value of proved oil and gas reserves. Probable and possible reserves, which may become proved in the future, are excluded from the calculations. Furthermore, year-end prices used to determine the standardized measure are influenced by seasonal
demand and other factors and may not be the most representative in estimating future revenues or reserve data.



|                                                                                |  |           |   |  |                            |   |  |            |   |  |                                |  
|------------------------------------------------------------------------------- |  | --------- | - |  | -------------------------- | - |  | ---------- | - |  | ------------------------------ | -
|Proved Reserves                                                                 |  | Gas (Mcf) |   |  | Natural Gas Liquids (Bbls) |   |  | Oil (Bbls) |   |  | Natural Gas Equivalents (Mcfe) |  
|(in millions)                                                                   |  |           |   |  |                            |   |  |            |   |  |                                |  
|December 31, 2003                                                               |  | 3,644.2   |   |  | 34.7                       |   |  | 55.4       |   |  | 4,184.9                        |  
|Revisions                                                                       |  | (96.1     | ) |  | (0.1                       | ) |  | 3.0        |   |  | (79.0                          | )
|Extensions, additions and discoveries                                           |  | 755.4     |   |  | 3.7                        |   |  | 4.2        |   |  | 802.8                          |  
|Production                                                                      |  | (305.5    | ) |  | (2.7                       | ) |  | (8.3       | ) |  | (371.7                         | )
|Purchases in place                                                              |  | 716.5     |   |  | 2.9                        |   |  | 98.2       |   |  | 1,323.3                        |  
|                                                                                |  |           |   |  |                            |   |  |            |   |  |                                |  
|December 31, 2004                                                               |  | 4,714.5   |   |  | 38.5                       |   |  | 152.5      |   |  | 5,860.3                        |  
|Revisions                                                                       |  | 4.0       |   |  | 5.3                        |   |  | 12.1       |   |  | 108.5                          |  
|Extensions, additions and discoveries                                           |  | 986.6     |   |  | 4.9                        |   |  | 34.2       |   |  | 1,221.2                        |  
|Production                                                                      |  | (377.1    | ) |  | (3.8                       | ) |  | (14.3      | ) |  | (485.5                         | )
|Purchases in place                                                              |  | 803.4     |   |  | 2.8                        |   |  | 31.1       |   |  | 1,007.1                        |  
|Sales in place                                                                  |  | (45.8     | ) |  | (0.3                       | ) |  | (6.9       | ) |  | (89.4                          | )
|                                                                                |  |           |   |  |                            |   |  |            |   |  |                                |  
|December 31, 2005                                                               |  | 6,085.6   |   |  | 47.4                       |   |  | 208.7      |   |  | 7,622.2                        |  
|Revisions                                                                       |  | (94.9     | ) |  | 1.8                        |   |  | 0.1        |   |  | (83.2                          | )
|Extensions, additions and discoveries                                           |  | 1,416.8   |   |  | 4.0                        |   |  | 20.3       |   |  | 1,562.6                        |  
|Production                                                                      |  | (433.0    | ) |  | (4.4                       | ) |  | (16.4      | ) |  | (557.6                         | )
|Purchases in place                                                              |  | 157.9     |   |  | 4.2                        |   |  | 3.3        |   |  | 202.9                          |  
|Sales in place(a)                                                               |  | (188.2    | ) |  |                           |   |  | (1.6       | ) |  | (198.3                         | )
|                                                                                |  |           |   |  |                            |   |  |            |   |  |                                |  
|December 31, 2006                                                               |  | 6,944.2   |   |  | 53.0                       |   |  | 214.4      |   |  | 8,548.6                        |  
|                                                                                |  |           |   |  |                            |   |  |            |   |  |                                |  
|(a)    Includes
effect of distribution of Hugoton Royalty Trust units (Note 9). |  |           |   |  |                            |   |  |            |   |  |                                |  
|                                                                                |  |           |   | 
|Proved Developed Reserves                                                       |  | Gas(Mcf)  |   |  | Natural GasLiquids(Bbls)   |   |  | Oil(Bbls)  |   |  | Natural GasEquivalents(Mcfe)   |  
|(in millions)                                                                   |  |           |   |  |                            |   |  |            |   |  |                                |  
|December 31, 2003                                                               |  | 2,651.3   |   |  | 28.2                       |   |  | 47.9       |   |  | 3,107.7                        |  
|                                                                                |  |           |   |  |                            |   |  |            |   |  |                                |  
|December 31, 2004                                                               |  | 3,252.7   |   |  | 30.0                       |   |  | 134.4      |   |  | 4,239.1                        |  
|                                                                                |  |           |   |  |                            |   |  |            |   |  |                                |  
|December 31, 2005                                                               |  | 4,033.1   |   |  | 36.5                       |   |  | 168.5      |   |  | 5,262.9                        |  
|                                                                                |  |           |   |  |                            |   |  |            |   |  |                                |  
|December 31, 2006                                                               |  | 4,481.6   |   |  | 40.1                       |   |  | 167.3      |   |  | 5,725.9                        |  
|                                                                                |  |           |   |  |                            |   |  |            |   |  |                                |  



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Standardized Measure of Discounted Future

|                                           |  |             |         |   |      |   |         |      |  |   |        |  
|------------------------------------------ |  | ----------- | ------- | - | ---- | - | ------- | ---- |  | - | ------ | -
|Net Cash Flows Relating to Proved Reserves |  | December 31 |        
|                                           |  | 2006        |         |   | 2005 |   |         | 2004 | 
|(in millions)                              |  |             |         |   |      |   |         |      | 
|Future cash inflows                        |  | $           | 51,477  |   |      | $ | 69,732  |      |  | $ | 34,027 |  
|Future costs:                              |  |             |         |   |      |   |         |      |  |   |        |  
|Production                                 |  |             | (14,958 | ) |      |   | (15,660 | )    |  |   | (8,842 | )
|Development                                |  |             | (4,260  | ) |      |   | (3,175  | )    |  |   | (1,580 | )
|                                           |  |             |         |   |      |   |         |      |  |   |        |  
|Future net cash flows before income tax    |  |             | 32,259  |   |      |   | 50,897  |      |  |   | 23,605 |  
|Future income tax                          |  |             | (10,251 | ) |      |   | (16,823 | )    |  |   | (7,366 | )
|                                           |  |             |         |   |      |   |         |      |  |   |        |  
|Future net cash flows                      |  |             | 22,008  |   |      |   | 34,074  |      |  |   | 16,239 |  
|10% annual discount                        |  |             | (11,180 | ) |      |   | (16,980 | )    |  |   | (7,837 | )
|                                           |  |             |         |   |      |   |         |      |  |   |        |  
|Standardized measure (a)                   |  | $           | 10,828  |   |      | $ | 17,094  |      |  | $ | 8,402  |  
|                                           |  |             |         |   |      |   |         |      |  |   |        |  

---

|(a) | Before income tax, the year-end standardized measure (or discounted present value of future net cash flows) was $16.2 billion in 2006, $25.8 billion for 2005 and $12.2 billion for
2004.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



|                                                                   |  |      |         |     |      |   |        |      |  |   |        |    
|------------------------------------------------------------------ |  | ---- | ------- | --- | ---- | - | ------ | ---- |  | - | ------ | ---
|Changes in Standardized Measure ofDiscounted Future Net Cash Flows |  | 2006 |         |     | 2005 |   |        | 2004 | 
|(in millions)                                                      |  |      |         |     |      |   |        |      | 
|Standardized measure, January 1                                    |  | $    | 17,094  |     |      | $ | 8,402  |      |  | $ | 5,989  |    
|                                                                   |  |      |         |     |      |   |        |      |  |   |        |    
|                                                                   |  |      |        
|Revisions:                                                         |  |      |         |     |      |   |        |      |  |   |        |    
|Prices and costs                                                   |  |      | (10,687 | )   |      |   | 8,506  |      |  |   | (20    | )  
|Quantity estimates                                                 |  |      | 960     |     |      |   | 708    |      |  |   | 437    |    
|Accretion of discount                                              |  |      | 1,511   |     |      |   | 741    |      |  |   | 517    |    
|Future development costs                                           |  |      | (2,479  | )   |      |   | (2,167 | )    |  |   | (797   | )  
|Income tax                                                         |  |      | 4,090   |     |      |   | (4,550 | )    |  |   | (979   | )  
|Production rates and other                                         |  |      | 3       |     |      |   | (2     | )    |  |   | (2     | )  
|                                                                   |  |      |         |     |      |   |        |      |  |   |        |    
|Net revisions                                                      |  |      | (6,602  | )   |      |   | 3,236  |      |  |   | (844   | )  
|Extensions, additions and discoveries                              |  |      | 2,248   |     |      |   | 3,723  |      |  |   | 1,384  |    
|Production                                                         |  |      | (3,629  | )   |      |   | (2,744 | )    |  |   | (1,512 | )  
|Development costs                                                  |  |      | 1,917   |     |      |   | 1,128  |      |  |   | 484    |    
|Purchases in place (a)                                             |  |      | 396     |     |      |   | 3,527  |      |  |   | 2,901  |    
|Sales in place (b)                                                 |  |      | (596    | )   |      |   | (178   | )    |  |   |       |    
|                                                                   |  |      |         |     |      |   |        |      |  |   |        |    
|Net change                                                         |  |      | (6,266  | )   |      |   | 8,692  |      |  |   | 2,413  |    
|                                                                   |  |      |         |     |      |   |        |      |  |   |        |    
|Standardized measure, December 31                                  |  | $    | 10,828  | (c) |      | $ | 17,094 | (d)  |  | $ | 8,402  | (e)
|                                                                   |  |      |         |     |      |   |        |      |  |   |        |    

---

|(a) | Generally based on the year-end present value (at year-end prices and costs) plus the cash flow received from such properties during the year, rather than the estimated
present value at the date of acquisition.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(b) | Generally based on beginning of the year present value (at beginning of year prices and costs) less the cash flow received from such properties during the year, rather than
the estimated present value at the date of sale. Included in 2006 is the effect of distribution of Hugoton Royalty Trust units (Note 9).
|--- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(c) | The December 31, 2006 standardized measure includes a reduction of $29 million ($46 million before income tax) for estimated property abandonment costs. The consolidated
balance sheet at December 31, 2006 includes a liability of $307 million for the same asset retirement obligation, which was calculated using different cost and present value assumptions as required by SFAS No. 143, as described above.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(d) | The December 31, 2005 standardized measure includes a reduction of $22 million ($34 million before income tax) for estimated property abandonment costs. The consolidated
balance sheet at December 31, 2005 includes a liability of $223 million for the same asset retirement obligation, which was calculated using different cost and present value assumptions as required by SFAS No. 143, as described above.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(e) | The December 31, 2004 standardized measure includes a reduction of $15 million ($23 million before income tax) for estimated property abandonment costs.
|--- | --------------------------------------------------------------------------------------------------------------------------------------------------------



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Price and cost revisions are primarily the net result of changes in year-end prices, based on beginning
of year reserve estimates. Quantity estimate revisions are primarily the result of the extended economic life of proved reserves and proved undeveloped reserve additions attributable to increased development activity.

Year-end average realized gas prices used in the estimation of proved reserves and calculation of the standardized measure were $5.46 for 2006, $9.26 for
2005, $5.69 for 2004 and $5.71 for 2003. Year-end average realized natural gas liquids prices were $31.96 for 2006, $36.33 for 2005, $28.24 for 2004 and $23.17 for 2003. Year-end average realized oil prices were $55.47 for 2006, $57.02 for 2005,
$41.03 for 2004, and $30.55 for 2003.



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MANAGEMENTS REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING

Our management is responsible for establishing and maintaining adequate internal control over financial reporting (as defined in Rule 13a-15(f) under the Securities
Exchange Act of 1934, as amended). Our management assessed the effectiveness of our internal control over financial reporting as of December 31, 2006. In making this assessment, our management used the criteria set forth by the Committee of
Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control-Integrated Framework. Our management has concluded that, based on these criteria, we have maintained in all material respects, effective internal control over
financial reporting as of December 31, 2006. Our independent registered public accounting firm, KPMG LLP, has issued an audit report on our assessment of our internal control over financial reporting, which is included herein.

Our management, including our Chief Executive Officer and Chief Financial Officer, does not expect that our disclosure controls and procedures or our internal controls
will prevent all error and all fraud. A control system, no matter how well conceived and operated, can provide only reasonable, not absolute, assurance that the objectives of the control system are met. Further, the design of a control system must
reflect that there are resource constraints, and the benefits of controls must be considered relative to their costs. Because of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that all
control issues and instances of fraud, if any, within our Company have been detected.

February 28, 2007



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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Stockholders of XTO Energy Inc.:

We have
audited the accompanying consolidated balance sheets of XTO Energy Inc. and its subsidiaries as of December 31, 2006 and 2005, and the related consolidated income statements, statements of cash flows and statements of stockholders equity
for each of the years in the three-year period ended December 31, 2006. These consolidated financial statements are the responsibility of the Companys management. Our responsibility is to express an opinion on these consolidated financial
statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States).
Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and
disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits
provide a reasonable basis for our opinion.

In our opinion, the consolidated financial statements referred to above present fairly, in all material
respects, the financial position of XTO Energy Inc. and its subsidiaries as of December 31, 2006 and 2005, and the results of their operations and their cash flows for each of the years in the three-year period ended December 31, 2006, in
conformity with U.S. generally accepted accounting principles.

As discussed in Note 1 to the consolidated financial statements, the Company adopted the
provisions of Statement of Financial Accounting Standards No. 123(R), Share-Based Payment, on January 1, 2006.

We also have audited, in
accordance with the standards of the Public Company Accounting Oversight Board (United States), the effectiveness of XTO Energy Inc.s internal control over financial reporting as of December 31, 2006, based on criteria established in
Internal ControlIntegrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO), and our report dated February 28, 2007 expressed an unqualified opinion on managements assessment of, and
the effective operation of, internal control over financial reporting.

KPMG LLP

Dallas, Texas

February 28, 2007



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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Stockholders of XTO Energy Inc.:

We have
audited managements assessment, included in the accompanying Managements Report on Internal Control over Financial Reporting, that XTO Energy Inc. and its subsidiaries maintained effective internal control over financial reporting as of
December 31, 2006, based on criteria established in Internal ControlIntegrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). XTO Energy Inc.s management is responsible for
maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting. Our responsibility is to express an opinion on managements assessment and an opinion on
the effectiveness of the Companys internal control over financial reporting based on our audit.

We conducted our audit in accordance with the
standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in
all material respects. Our audit included obtaining an understanding of internal control over financial reporting, evaluating managements assessment, testing and evaluating the design and operating effectiveness of internal control, and
performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A
companys internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with
generally accepted accounting principles. A companys internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect
the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting
principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of
unauthorized acquisition, use, or disposition of the companys assets that could have a material effect on the financial statements.

Because of its
inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of
changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, managements assessment that
XTO Energy Inc. and its subsidiaries maintained effective internal control over financial reporting as of December 31, 2006, is fairly stated, in all material respects, based on criteria established in Internal ControlIntegrated Framework
issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). Also, in our opinion, XTO Energy Inc. maintained, in all material respects, effective internal control over financial reporting as of December 31, 2006,
based on criteria established in Internal ControlIntegrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheets of XTO Energy Inc. and its subsidiaries as of December 31, 2006 and 2005, and the
related consolidated income statements, statements of cash flows and statements of stockholders equity for each of the years in the three-year period ended December 31, 2006, and our report dated February 28, 2007 expressed an
unqualified opinion on those consolidated financial statements.

KPMG LLP

Dallas, Texas

February 28, 2007



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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant
has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized, on the 1stday
of March 2007.



XTO ENERGY INC.By

/s/ BOB R. SIMPSONBob R. Simpson, Chairman of the Boardand Chief Executive Officer


Pursuant to the requirements of the Securities
Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities indicated on the 1stday of March 2007.



|                                           |  |  |  |                                         
|------------------------------------------ |  |  |  | ----------------------------------------
|PRINCIPAL EXECUTIVE OFFICERS               |  |  |  | DIRECTORS                               
|(AND DIRECTORS)                            |  |  |  |                                         
|                                           |  | 
|/s/ BOB R.
SIMPSON                         |  |  |  | /s/ WILLIAM H. ADAMS III                
|Bob R. Simpson, Chairman of the Board      |  |  |  | William H. Adams III                    
|and Chief Executive Officer                |  |  |  |                                         
|                                           |  | 
|/s/ KEITH A,
HUTTON                        |  |  |  | /s/ LANE G. COLLINS                     
|Keith A. Hutton, President                 |  |  |  | Lane G. Collins                         
|                                           |  | 
|/s/ VAUGHN O.
VENNERBERG II                |  |  |  | /s/ PHILLIP R. KEVIL                    
|Vaughn O. Vennerberg II, Senior            |  |  |  | Phillip R. Kevil                        
|Executive Vice President and               |  |  |  |                                         
|Chief of Staff                             |  |  |  |                                         
|                                           |  |  |  | /s/ JACK P. RANDALL                     
|                                           |  |  |  | Jack P. Randall                         
|                                           |  | 
|                                           |  |  |  | /s/ SCOTT G. SHERMAN                    
|                                           |  |  |  | Scott G. Sherman                        
|                                           |  | 
|                                           |  |  |  | /s/ HERBERT D. SIMONS                   
|                                           |  |  |  | Herbert D. Simons                       
|                                           |  | 
|PRINCIPAL FINANCIAL OFFICER                |  |  |  | PRINCIPAL ACCOUNTING OFFICER            
|                                           |  | 
|/s/ LOUIS G.
BALDWIN                       |  |  |  | /s/ BENNIE G. KNIFFEN                   
|Louis G. Baldwin, Executive Vice President |  |  |  | Bennie G. Kniffen, Senior Vice President
|and Chief Financial Officer                |  |  |  | and Controller                          



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INDEX TO EXHIBITS

Documents filed prior to June 1, 2001 were filed with the Securities and Exchange Commission under our prior name, Cross Timbers Oil Company.



|           |  |                                                                                                                                                                                                                                                                           |  |     
|---------- |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ----
|ExhibitNo. |  | Description                                                                                                                                                                                                                                                               |  | Page
|2.1 +      |  | Asset Sale Agreement dated May 14, 2004 between Chevron U.S.A. Inc. as Seller and XTO Energy Inc. as Buyer (incorporated by reference to Exhibit 2.1 to Form 8-K filed August 19,
2004)                                                                                   |  |     
|           |  |                                                                                                                                                                                                                                                                          
|2.2 +      |  | Agreement and Plan of Merger dated January 9, 2005 among XTO Energy Inc., XTO Barnett Inc., and Antero Resources Corporation (incorporated by reference to Exhibit 2.2 to Form 10-K for the
year ended December 31, 2004)                                                 |  |     
|           |  |                                                                                                                                                                                                                                                                          
|2.3 +      |  | Amendment No. 1 to Agreement and Plan of Merger dated February 3, 2005 among XTO Energy Inc., XTO Barnett Inc., and Antero Resources Corporation (incorporated by reference to Exhibit 2.3 to
Form 10-K for the year ended December 31, 2004)                             |  |     
|           |  |                                                                                                                                                                                                                                                                          
|2.4 +      |  | Amendment No. 2 to Agreement and Plan of Merger dated March 22, 2005 among the Company, XTO Barnett Inc., XTO Barnett LLC and Antero Resources Corporation (incorporated by reference to
Exhibit 2.1 to Form 8-K filed March 28, 2005)                                    |  |     
|           |  |                                                                                                                                                                                                                                                                          
|2.5 +      |  | Amendment No. 3 to Agreement and Plan of Merger dated March 31, 2005 among the Company, XTO Barnett Inc., XTO Barnett LLC and Antero Resources Corporation (incorporated by reference to
Exhibit 2.1 to Form 8-K filed April 5, 2005)                                     |  |     
|           |  |                                                                                                                                                                                                                                                                          
|3.1        |  | Restated Certificate of Incorporation of the Company, as restated on June 21, 2006 (incorporated by reference to Exhibit 3.1 to Form 10-Q for the quarter ended June 30,
2006)                                                                                            |  |     
|           |  |                                                                                                                                                                                                                                                                          
|3.2        |  | Amended and Restated Bylaws of the Company dated November 18, 2003 (incorporated by reference to Exhibit 3.1 to Form 10-Q for the quarter ended March 31, 2006)                                                                                                           |  |     
|           |  |                                                                                                                                                                                                                                                                          
|4.1        |  | Form of Indenture for Senior Debt Securities dated as of April 23, 2002 between the Company and the Bank of New York, as Trustee (incorporated by reference to Exhibit 4.3.1 to Form 8-K
filed April 17, 2002)                                                            |  |     
|           |  |                                                                                                                                                                                                                                                                          
|4.2        |  | First Supplemental Indenture dated as of April 23, 2002 between the Company and the Bank of New York, as Trustee for the 71/2% Senior Notes due 2012 (incorporated by reference to Exhibit 4.2 to Form 10-K for the year ended December 31, 2002)                         |  |     
|           |  |                                                                                                                                                                                                                                                                          
|4.3        |  | Second Supplemental Indenture dated as of October 1, 2005 between the Company and The Bank of New York Trust Company, as Successor Trustee, for 7 1/2% Senior Notes due 2012 (incorporated by reference to Exhibit 4.3 to Form 10-Q for the quarter ended March 31,
2006) |  |     
|           |  |                                                                                                                                                                                                                                                                          
|4.4        |  | Preferred Stock Purchase Rights Agreement dated August 25, 1998 between the Company and ChaseMellon Shareholder Services, LLC (incorporated by reference to Exhibit 4.1 to Form 8-A/A filed
September 8, 1998)                                                            |  |     
|           |  |                                                                                                                                                                                                                                                                          
|4.5        |  | Certificate of Designation of Series A Junior Participating Preferred Stock, par value $ 0.01 per share, dated August 25, 1998 (incorporated by reference to Exhibit 4.1 to Form 10-Q for the
quarter ended September 30, 2000)                                           |  |     



92



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|           |  |                                                                                                                                                                                                                                                                                              |  |     
|---------- |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ----
|ExhibitNo. |  | Description                                                                                                                                                                                                                                                                                  |  | Page
|4.6        |  | Registration Rights Agreement among the Company and partners of Cross Timbers Oil Company, L.P. (incorporated by reference to Exhibit 10.9 to Registration Statement on Form S-1, File No.
33-59820)                                                                                         |  |     
|           |  |                                                                                                                                                                                                                                                                                             
|4.7        |  | Indenture dated as of April 23, 2003 between the Company and the Bank of New York, as Trustee for the 61/4% Senior Notes due 2013 (incorporated by reference to Exhibit 4.1 to Form 10-Q for the quarter ended March 31, 2003)                                                               |  |     
|           |  |                                                                                                                                                                                                                                                                                             
|4.8        |  | First Supplemental Indenture dated as of October 1, 2005 between the Company and The Bank of New York Trust Company, as Successor Trustee, for 6 1/4% Senior Notes due 2013 (incorporated by
reference to Exhibit 4.4 to Form 10-Q for the quarter ended March 31, 2006)                     |  |     
|           |  |                                                                                                                                                                                                                                                                                             
|4.9        |  | Registration Rights Agreement dated April 23, 2003 between the Company and certain Initial Purchasers named therein (incorporated by reference to Exhibit 4.2 to Form 10-Q for the quarter ended
March 31, 2003)                                                                             |  |     
|           |  |                                                                                                                                                                                                                                                                                             
|4.10       |  | Indenture for Senior Debt Securities dated as of January 22, 2004 between the Company and the Bank of New York, as Trustee (incorporated by reference to Exhibit 4.3.1 to Form 8-K filed January
16, 2004)                                                                                   |  |     
|           |  |                                                                                                                                                                                                                                                                                             
|4.11       |  | First Supplemental Indenture dated as of January 22, 2004 between the Company and the Bank of New York, as Trustee for the 4.90% Senior Notes due 2014 (incorporated by reference to Exhibit 4.3.2
to Form 8-K filed January 16, 2004)                                                       |  |     
|           |  |                                                                                                                                                                                                                                                                                             
|4.12       |  | Second Supplemental Indenture dated as of October 1, 2005 between the Company and The Bank of New York Trust Company, as Successor Trustee, for 4.90% Senior Notes due 2014 (incorporated by
reference to Exhibit 4.5 to Form 10-Q for the quarter ended March 31, 2006)                     |  |     
|           |  |                                                                                                                                                                                                                                                                                             
|4.13       |  | Indenture dated as of September 23, 2004 between the Company and the Bank of New York, as Trustee for the 5% Senior Notes due 2015 (incorporated by reference to Exhibit 4.1 to Form 8-K filed
September 24, 2004)                                                                           |  |     
|           |  |                                                                                                                                                                                                                                                                                             
|4.14       |  | First Supplemental Indenture dated as of October 1, 2005 between the Company and The Bank of New York Trust Company, as Successor Trustee, for 5% Senior Notes due 2015 (incorporated by reference
to Exhibit 4.6 to Form 10-Q for the quarter ended March 31, 2006)                         |  |     
|           |  |                                                                                                                                                                                                                                                                                             
|4.15       |  | Indenture for Senior Debt Securities dated as of April 13, 2005 between the Company and the Bank of New York, as Trustee (incorporated by reference to Exhibit 4.3.1 to Form 8-K filed April 12,
2005)                                                                                       |  |     
|           |  |                                                                                                                                                                                                                                                                                             
|4.16       |  | First Supplemental Indenture dated as of April 13, 2005 between the Company and the Bank of New York, as Trustee for 5.30% Senior Notes due 2015 (incorporated by reference to Exhibit 4.3.2 to
Form 8-K filed April 12, 2005)                                                               |  |     
|           |  |                                                                                                                                                                                                                                                                                             
|4.17       |  | Second Supplemental Indenture dated as of October 1, 2005 between the Company and The Bank of New York Trust Company, as Successor Trustee, for 5.30% Senior Notes due 2015 (incorporated by
reference to Exhibit 4.1 to Form 10-Q for the quarter ended March 31, 2006)                     |  |     
|           |  |                                                                                                                                                                                                                                                                                             
|4.18       |  | Third Supplemental Indenture dated as of March 30, 2006 between the Company and The Bank of New York Trust Company, as Trustee, for 5.65% Senior Notes due 2016 and 6.10% Senior Notes due 2036
(incorporated by reference to Exhibit 4.2 to Form 10-Q for the quarter ended March 31, 2006) |  |     



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|           |  |                                                                                                                                                                                                                                                 |  |     
|---------- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ----
|ExhibitNo. |  | Description                                                                                                                                                                                                                                     |  | Page
|4.19       |  | Registration Rights Agreement dated April 1, 2005 among XTO Energy Inc. and the security holders of Antero Resources Corporation (incorporated by reference to Exhibit 4.1 to Form 10-Q for
the quarter ended June 30, 2005)                    |  |     
|           |  |                                                                                                                                                                                                                                                
|10.1*      |  | Amended and Restated Employment Agreement between the Company and Bob R. Simpson, dated May 17, 2000 (incorporated by reference to Exhibit 10.2 to Form 10-Q for the quarter ended
June 30, 2000)                                               |  |     
|           |  |                                                                                                                                                                                                                                                
|10.2*      |  | Amendment to Amended and Restated Employment Agreement between the Company and Bob R. Simpson, dated August 20, 2002 (incorporated by reference to Exhibit 10.1 to Form 10-Q for the quarter
ended September 30, 2002)                          |  |     
|           |  |                                                                                                                                                                                                                                                
|10.3*      |  | Employment Agreement between the Company and Bob R. Simpson, dated May 16, 2006 (incorporated by reference to Exhibit 10.2 to Form 10-Q for the quarter ended June 30, 2006)                                                                    |  |     
|           |  |                                                                                                                                                                                                                                                
|10.4*      |  | Employment Agreement between the Company and Keith A. Hutton, dated May 16, 2006 (incorporated by reference to Exhibit 10.3 to Form 10-Q for the quarter ended June 30,
2006)                                                                   |  |     
|           |  |                                                                                                                                                                                                                                                
|10.5*      |  | Employment Agreement between the Company and Vaughn O. Vennerberg II, dated May 16, 2006 (incorporated by reference to Exhibit 10.4 to Form 10-Q for the quarter ended June 30,
2006)                                                           |  |     
|           |  |                                                                                                                                                                                                                                                
|10.6*      |  | Amended and Restated Employment Agreement between the Company and Steffen E. Palko, dated May 17, 2000 (incorporated by reference to Exhibit 10.3 to Form 10-Q for the quarter ended
June 30, 2000)                                             |  |     
|           |  |                                                                                                                                                                                                                                                
|10.7*      |  | Amendment to Amended and Restated Employment Agreement between the Company and Steffen E. Palko, dated August 20, 2002 (incorporated by reference to Exhibit 10.2 to Form 10-Q for the
quarter ended September 30, 2002)                        |  |     
|           |  |                                                                                                                                                                                                                                                
|10.8*      |  | 1998 Stock Incentive Plan, as amended March 17, 2004 (incorporated by reference to Exhibit 10.1 to Form 10-Q for the quarter ended March 31, 2004)                                                                                              |  |     
|           |  |                                                                                                                                                                                                                                                
|10.9*      |  | XTO Energy Inc. Amended and Restated 2004 Stock Incentive Plan (incorporated by reference to Appendix B to the Proxy Statement dated April 13, 2006 for the Annual Meeting of Stockholders
held May 16, 2006)                                   |  |     
|           |  |                                                                                                                                                                                                                                                
|10.10*     |  | XTO Energy Inc. Amended and Restated 2004 Stock Incentive Plan (as amended and restated through November 21, 2006)                                                                                                                              |  |     
|           |  |                                                                                                                                                                                                                                                
|10.11*     |  | Form of Nonqualified Stock Option Agreement for Employees under the 2004 Stock Incentive Plan (incorporated by reference to Exhibit 10.2 to Form 8-K filed November 22, 2004)                                                                   |  |     
|           |  |                                                                                                                                                                                                                                                
|10.12*     |  | Form of Nonqualified Stock Option Agreement for Employees with Employment Agreements under the Amended and Restated 2004 Stock Incentive Plan (incorporated by reference to Exhibit 10.4 to Form
10-Q for the quarter ended September 30, 2006) |  |     
|           |  |                                                                                                                                                                                                                                                
|10.13*     |  | Form of Stock Award Agreement for Employees under the 2004 Stock Incentive Plan (incorporated by reference to Exhibit 10.3 to Form 8-K filed November 22, 2004)                                                                                 |  |     
|           |  |                                                                                                                                                                                                                                                
|10.14*     |  | Form of Nonqualified Stock Option Agreement for Non-Employee Directors under the 2004 Stock Incentive Plan (incorporated by reference to Exhibit 10.4 to Form 8-K filed November 22,
2004)                                                      |  |     



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|           |  |                                                                                                                                                                                                                                                                                                       |  |     
|---------- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ----
|ExhibitNo. |  | Description                                                                                                                                                                                                                                                                                           |  | Page
|           |  |                                                                                                                                                                                                                                                                                                      
|10.15*     |  | Form of Stock Award Agreement for Non-Employee Directors under the 2004 Stock Incentive Plan (incorporated by reference to Exhibit 10.5 to Form 8-K filed November 22, 2004)                                                                                                                          |  |     
|           |  |                                                                                                                                                                                                                                                                                                      
|10.16*     |  | Form of Stock Grant Agreement for Non-Employee Directors under Section 11 of the 2004 Stock Incentive Plan (incorporated by reference to Exhibit 10.1 to Form 8-K filed February 22,
2005)                                                                                                            |  |     
|           |  |                                                                                                                                                                                                                                                                                                      
|10.17*     |  | Amended Employee Severance Protection Plan, as amended February 15, 2000 (incorporated by reference to Exhibit 10.14 to Form 10-K for the year ended December 31, 1999)                                                                                                                               |  |     
|           |  |                                                                                                                                                                                                                                                                                                      
|10.18*     |  | Amendment to Amended Employee Severance Protection Plan, as amended August 20, 2002 (incorporated by reference to Exhibit 10.5 to Form 10-Q for the quarter ended September 30, 2002)                                                                                                                 |  |     
|           |  |                                                                                                                                                                                                                                                                                                      
|10.19*     |  | Second Amended and Restated Employee Severance Protection Plan, as amended August 15, 2006 (incorporated by reference to Exhibit 10.1 to Form 10-Q for the quarter ended September 30,
2006)                                                                                                          |  |     
|           |  |                                                                                                                                                                                                                                                                                                      
|10.20*     |  | Amended and Restated Management Group Employee Severance Protection Plan, as amended February 15, 2000 (incorporated by reference to Exhibit 10.13 to Form 10-K for the year ended December 31,
1999)                                                                                                 |  |     
|           |  |                                                                                                                                                                                                                                                                                                      
|10.21*     |  | Amendment to Amended and Restated Management Group Employee Severance Protection Plan, as amended August 20, 2002 (incorporated by reference to Exhibit 10.4 to Form 10-Q for the quarter ended
September 30, 2002)                                                                                   |  |     
|           |  |                                                                                                                                                                                                                                                                                                      
|10.22*     |  | Second Amended and Restated Management Group Employee Severance Protection Plan, as amended August 15, 2006 (incorporated by reference to Exhibit 10.2 to Form 10-Q for the quarter ended
September 30, 2006)                                                                                         |  |     
|           |  |                                                                                                                                                                                                                                                                                                      
|10.23*     |  | Outside Directors Severance Plan dated August 20, 2002 (incorporated by reference to Exhibit 10.6 to Form 10-Q for the quarter ended September 30, 2002)                                                                                                                                              |  |     
|           |  |                                                                                                                                                                                                                                                                                                      
|10.24*     |  | Amended and Restated Outside Directors Severance Plan, as amended August 15, 2006 (incorporated by reference to Exhibit 10.3 to Form 10-Q for the quarter ended September 30, 2006)                                                                                                                   |  |     
|           |  |                                                                                                                                                                                                                                                                                                      
|10.25*     |  | Form of Amended and Restated Agreement (relating to change in control) between the Company and Bob R. Simpson, Steffen E. Palko, Louis G. Baldwin, Keith A. Hutton and Vaughn O. Vennerberg II,
dated October 15, 2004 (incorporated by reference to Exhibit 10.1 to Form 8-K filed October 21, 2004) |  |     
|           |  |                                                                                                                                                                                                                                                                                                      
|10.26*     |  | Form of Amendment No. One to Amended and Restated Agreement (relating to change in control) between the Company and Bob R. Simpson, Louis G. Baldwin, Keith A. Hutton and Vaughn O. Vennerberg,
dated November 21, 2006                                                                               |  |     
|           |  |                                                                                                                                                                                                                                                                                                      
|10.27*     |  | Agreement (relating to change in control) between the Company and Timothy L Petrus, dated November 21, 2006                                                                                                                                                                                           |  |     
|           |  |                                                                                                                                                                                                                                                                                                      
|10.28*     |  | Consulting and Non-Competition Agreement dated April 1, 2005 between the Company and Steffen E. Palko (incorporated by reference to Exhibit 10.1 to Form 8-K filed April 5, 2005)                                                                                                                     |  |     



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|           |  |                                                                                                                                                                                                                                                                                             |  |     
|---------- |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ----
|ExhibitNo. |  | Description                                                                                                                                                                                                                                                                                 |  | Page
|10.29*     |  | Form of Indemnification Agreement dated November 15, 2005 between the Company and each director, executive officer and certain other officers (incorporated by reference to Exhibit 10.1 to
Form 8-K filed November 18, 2005)                                                               |  |     
|           |  |                                                                                                                                                                                                                                                                                            
|10.30*     |  | Form of Stock Award Agreement (Restricted Shares) for Employees under the 2004 Stock Incentive Plan                                                                                                                                                                                         |  |     
|           |  |                                                                                                                                                                                                                                                                                            
|10.31*     |  | Phantom Performance Share Award Agreement between the Company and Bob R. Simpson, dated April 23, 2004 (incorporated by reference to Form 10-Q for the quarter ended June 30, 2004)                                                                                                         |  |     
|           |  |                                                                                                                                                                                                                                                                                            
|10.32*     |  | Phantom Performance Share Award Agreement between the Company and Bob R. Simpson, dated June 18, 2004 (incorporated by reference to Form 10-Q for the quarter ended June 30, 2004)                                                                                                          |  |     
|           |  |                                                                                                                                                                                                                                                                                            
|10.33*     |  | Form of Agreement for Grant of Phantom Performance Shares between the Company and each of Bob R. Simpson, Steffen E. Palko, Louis G. Baldwin, Keith A. Hutton and Vaughn O. Vennerberg II, dated
June 24, 2004 (incorporated by reference to Form 10-Q for the quarter ended June 30, 2004) |  |     
|           |  |                                                                                                                                                                                                                                                                                            
|10.34*     |  | Form of Agreement for Grant of Phantom Performance Shares between the Company and each of Bob R. Simpson, Steffen E. Palko, Louis G. Baldwin, Keith A. Hutton and Vaughn O. Vennerberg II, dated
July 8, 2004 (incorporated by reference to Form 10-Q for the quarter ended June 30, 2004)  |  |     
|           |  |                                                                                                                                                                                                                                                                                            
|10.35      |  | 5-Year Revolving Credit Agreement dated February 17, 2004 between the Company and certain commercial banks named therein (incorporated by reference to Exhibit 10.18 to Form 10-K for the year
ended December 31, 2003)                                                                     |  |     
|           |  |                                                                                                                                                                                                                                                                                            
|10.36      |  | Amended and Restated 5-Year Revolving Credit Agreement dated April 1, 2005 between the Company and certain commercial banks named therein (incorporated by reference to Exhibit 10.3 to Form 10-Q
for the quarter ended March 31, 2005)                                                     |  |     
|           |  |                                                                                                                                                                                                                                                                                            
|10.37      |  | First Amendment to Five-Year Revolving Credit Agreement dated March 10, 2006 between the Company and certain commercial banks named therein (incorporated by reference to Exhibit 10.1 to Form
10-Q for the quarter ended March 31, 2006)                                                   |  |     
|           |  |                                                                                                                                                                                                                                                                                            
|10.38      |  | Second Amendment to Five-Year Revolving Credit Agreement dated October 25, 2006 between the Company and certain commercial banks named therein (incorporated by reference to Exhibit 10.5 to Form
10-Q for the quarter ended September 30, 2006)                                            |  |     
|           |  |                                                                                                                                                                                                                                                                                            
|10.39      |  | Term Loan Credit Agreement dated November 10, 2004 between the Company and certain commercial banks named therein (incorporated by reference to Exhibit 10.20 to Form S-4 dated December 13,
2004)                                                                                          |  |     
|           |  |                                                                                                                                                                                                                                                                                            
|10.40      |  | First Amendment to Term Loan Agreement dated April 1, 2005 between the Company and certain banks named therein (incorporated by reference to Exhibit 10.4 to Form 10-Q for the quarter ended March
31, 2005)                                                                                |  |     
|           |  |                                                                                                                                                                                                                                                                                            
|10.41      |  | Second Amendment to Term Loan Agreement dated March 10, 2006 between the Company and certain commercial banks named therein (incorporated by reference to Exhibit 10.2 to Form 10-Q for the
quarter ended March 31, 2006)                                                                   |  |     



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##### Table of Contents

|           |  |                                                                                                                                                                                                                                                                                                                                                                                                                                        |  |     
|---------- |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ----
|ExhibitNo. |  | Description                                                                                                                                                                                                                                                                                                                                                                                                                            |  | Page
|10.42      |  | Firm Intrastate Gas Transportation Agreement dated July 1, 2005 between the Company, XTO Resources I, LP and Energy Transfer Fuel, LP (incorporated by reference to Exhibit 10.1 to Form 10-Q for
the quarter ended September 30, 2005) (Material has been omitted from this Exhibit pursuant to a request for confidential treatment and the omitted material has been separately filed with the Securities and Exchange Commission.) |  |     
|           |  |                                                                                                                                                                                                                                                                                                                                                                                                                                       
|12.1       |  | Computation of Ratio of Earnings to Fixed Charges                                                                                                                                                                                                                                                                                                                                                                                      |  |     
|           |  |                                                                                                                                                                                                                                                                                                                                                                                                                                       
|21.1       |  | Subsidiaries of XTO Energy Inc.                                                                                                                                                                                                                                                                                                                                                                                                        |  |     
|           |  |                                                                                                                                                                                                                                                                                                                                                                                                                                       
|23.1       |  | Consent of KPMG LLP                                                                                                                                                                                                                                                                                                                                                                                                                    |  |     
|           |  |                                                                                                                                                                                                                                                                                                                                                                                                                                       
|23.2       |  | Consent of Miller and Lents, Ltd.                                                                                                                                                                                                                                                                                                                                                                                                      |  |     
|           |  |                                                                                                                                                                                                                                                                                                                                                                                                                                       
|31         |  | Rule 13a-14(a)/15d-14(a) Certifications                                                                                                                                                                                                                                                                                                                                                                                                |  |     
|           |  |                                                                                                                                                                                                                                                                                                                                                                                                                                       
|31.1       |  | Chief Executive Officer Certification pursuant to Section 302 of the Sarbanes-Oxley Act of 2002                                                                                                                                                                                                                                                                                                                                        |  |     
|           |  |                                                                                                                                                                                                                                                                                                                                                                                                                                       
|31.2       |  | Chief Financial Officer Certification pursuant to Section 302 of the Sarbanes-Oxley Act of 2002                                                                                                                                                                                                                                                                                                                                        |  |     
|           |  |                                                                                                                                                                                                                                                                                                                                                                                                                                       
|32         |  | Section 1350 Certifications                                                                                                                                                                                                                                                                                                                                                                                                            |  |     
|           |  |                                                                                                                                                                                                                                                                                                                                                                                                                                       
|32.1       |  | Chief Executive Officer and Chief Financial Officer Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002                                                                                                                                                                                                                                                             |  |     

---

|+ | All schedules and similar attachments have been omitted. The Company agrees to furnish supplementally a copy of the omitted schedules and similar attachments to the Securities and
Exchange Commission upon request.
|- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|* | Management contract or compensatory plan
|- | ----------------------------------------

Copies of the above exhibits
not contained herein are available, at the cost of reproduction, to any security holder upon written request to the Secretary, XTO Energy Inc., 810 Houston Street, Fort Worth, Texas 76102.



97